Dimension One usually has quality products. I've worked on them in past, typically older units for the the usual things the wear out over tie like pump motors, heater elements and the like. Spa makers change shell designs regularly but the inner workings pretty much stay the same. YMMV. Please keep it above ground. Dropping it in a deck usually makes service harder, especially if there is a leak and the unit needs to be raised for proper access. Gaskets do dry out over time. It is a real pain when a leaking drain or low lying jet needs attention and the only access is from under it. As a service man, the easier the access, the faster I work, the less it costs to fix.

I sometimes wonder why anyone posts his plans on this site. We come from SO many perspectives! Most people posting are building a house in a subdivision, not people buying property and then designing a house for their needs that suits the property. If someone is even considering a subdivision-type house, or is looking to adapt "stock" plans, then that is exactly how that person wants his house to look and be arranged. That's the kind of house they like and most likely the kind their friends have, too. Then there is an outlier such as me. My "subdivision house" was built in 1948, and in fact, all the houses were custom built in this subdivision. Some of the ones built just before WWII were two story colonials that were identical inside, but slightly different on the outside. Over the years, various owners have added on and done so in different ways, so unless one knows the history of the neighborhood, it is not apparent. If one is determined to have an "open concept" floor plan, and a first floor master suite, the floor plan is pretty much predetermined. I have LOTS of problems with such plans as I think that ultimately, they don't work very well. The space always appears quite large on the floor plan, but when furniture is floated and not mostly against walls, one loses a LOT of space. Add lots of large family entertaining, and even at 3500 sq feet, it will feel cramped/crowded. "Open concept" works best in tiny houses where separate rooms would feel like a rabbit warren, or in very large ones, with tons of room to float furniture (think McMansion). People today want lots of garages as many families have lots of cars. For decades, a ONE car garage was standard, and then a 2 car became the standard about 70 years ago. Now, it is not unusual to see 4-5 car garages. The problem, of course, is how to site them - they are an imposing presence! And then there is the cost. Even though it is never included in the square footage of a house for sale, it does factor in the square footage cost of building and it can be a LOT! A friend of my daughter lives on a horse farm and built a house on the family farm. She wanted a beautiful, gracious home with lots of millwork details. It was custom designed and the bids to construct it came in a 4 times their budget. So, they did without the first floor MBR suite for 5-7 years and then added it, living in a 2nd flr smaller bedroom in the meantime. It was tight up there with three girls and their stuff! Ten years later, they finally added the garages. I think they have 4 at least. Sometimes a longterm plan is the best. One figures out how to get what one wants in the public rooms in a house, especially if one has large groups often. Then one saves to add onto the house and the design is already done and ready to go when the money is there. Believe me, I LOVE my garage - I'm far too old to be scrapping windshields! But perhaps you need to chose between that and the sport's court and make sure you have made your public rooms big enough for a crowd...or just your own very large family! Do speak to a roofer about your roof design. A roofer friend said that most houses today, with their multiple gables etc, cost a fortune when a new roof is needed ($30,000 to 40,000)!. They are very labor intensive, whereas a traditional single peaked roof (front and back both the same with no gables), is far less expensive. You don't mention if you have trees nearby; if you do, the leaves will gather in the valleys and are a huge nuisance. Good luck!

regarding W/D in the home gym.... If you do that, then you have forever relegated that room to a laundry room. It becomes a very large laundry that is used as a gym. IMHO, I don't think a very large laundry will be a selling point. I would rather have a multipurpose room that can used for many different things. If you keep the home gym as a multipurpose generic room, then it can be used as a guest bedroom, kids playroom etc etc as your life changes. However, if you are willing to give up the bedroom, it solves the issue of your powder room where the guest is not walking through the laundry area. In general, it is nice to be able to direct the guests to the powder room which is NOT a personal bathroom. If you direct the guests to the hall bath, that is in the private area. My guess is that you want a useful/nicer powder room for the guests to use. When you remodel, you think you solved one problem, you notice another problem! I would work the floor plan more so that you have a really nice inviting 1/2 bath with better doors in that hallway. You are already doing an enormous amount of work. This will not add that much to the work. At this point, it is just your time....

I agree, the light fixture needs replacing or remove it altogether. I can't see your floors, but my suggestion is to keep this room as a sunroom. I would lay tile for your floors. Now is the time to find outdoor furniture on sale so I would suggest a small table and chairs or two nice rattan arm chairs with cushions and make this a relaxing place to read or relax with drinks. In the alcove what about a nice bookshelf for books and accessories? Wall color should be a light neutral.