That seems like it would make a lot of sense to me, and it looks like you have plenty of room, particularly since you can recapture a bit of all if you don't need the bathroom accessed from the hall. Also, if these rooms are for guests, large closets really aren't needed, so long as you have storage other places in the house.

Show both full floor plans, bedrooms do not exist in vacuums.

And get rid of all barn doors.

I would add the en-suites and change to reach-in closets. We have a mountain vacation house and reach-ins are all that is needed in the bedrooms. Make sure you have sufficient storage elsewhere for all your lake-related gear and toys.

I agree that reach-in closets are adequate in a vacation house, unless the rooms will be used by family members (not guests) who want to leave lots of clothing or other stuff at the vacation house. Since there will be a powder room on the main floor, there is no need for any hall bathroom, and the possibility of four people sharing the bunk room is a good argument for two full (or 3/4) baths upstairs. I would be careful, however, not to eliminate the linen closet, although it could be relocated.

Barn doors are fine depending on the style of your home. I wanted a couple for closets in my log home build, but the electrician apparently liked them about as much as Mark does, and wired the walls such that I wouldn't have access to the outlets if I ended up putting them in... Too much of a bother to change that back to the blueprint, so I went with the flow...

RE making the closets reach-in: this sounds reasonable. Being third or fourth bedrooms, I assume at least the master has a walk-in. And these are guest rooms, so the loss of closet space should not be an issue, even if you have guests who spend a summer.

AT 4 feet deep, your closets already are reach-in. They're just unnecessarily taking up an extra 2 feet in depth each, and access is currently difficult. Even if you leave them the way they are, at the very least change the doors to swing out so you can actually get in there.

I helps to layout the hanging clothes in clothes closets and items to be stored in linen closets. I plan hanging clothes to be at least 24" wide from shoulder to shoulder. In the illustration below the green shirt will be difficult to find and difficult to retrieve. Do not turn corners with hanging clothes. The closet door will hit the hanging clothes when fully open.

In the linen closet the green box will be hard to find and difficult to remove without disturbing the other items on that shelf. Reach-in linen closets should have a door or doors almost as wide as the width of the closet.

In some lake houses I have designed, I provided a 24" wide shelf and rod on the wall. Guests can hang their clothes on the rod (if they brought any that needs hanging), folded clothes on the shelf, and their luggage sets on a chair below.

Barn doors do not provide an adequate visual or sound barrier to be used for a bedroom door, and they take up wall space where art can hang.

I agree with others, having an en-suite bath off each bedroom will be much nicer for guests. The plan we're building for our lakehouse has two separate bedrooms upstairs, each with their own en-suite. That makes for a much better experience for guests, since they have private access to their own dedicated bathroom during the night, for taking showers, etc without having to worry about walking through a shared hallway space.

We have a weekend house and I agree with adding the extra full baths.

We did a pocket door for the powder room because we couldn't have a traditional swing door. Its a good alternative to a barn door.

If you have the space, have the reach in closet doors open out. Or, arrange for sliding closet doors.

Thank you for all the suggestions. The decision has been made to reconfigure the upstairs to include 2 smaller en suite bathrooms AND to get rid of the barn door for Bedroom 3 (Thank you, @Mark Bischak, Architect). We will may, lose the linen closet however. There are other storage options for linens for the upstairs rooms if that is the case.

For what its worth, here is a design with a (I think) similar layout. The one bigger bedroom on the second floor is designed for adult guests. The other smaller bedroom on the second floor is for grandchildren. Notice the distance between the two.

"There are other storage options for linens for the upstairs rooms if that is the case."

In our current cabin, I have a centralized shelf that holds stacks of wash cloths, hand towels, bath towels, bath sheets, etc. Guests can take what they need. I find people are more comfortable doing that than poking around in a closet.

In the second cottage I am currently renovating, I will do shelving in each room because the cottage lack the room for a common shelf.

In the newly configured bathrooms, put in single sinks. Guests need some counter space in the bathroom, and a single sink provides more storage space underneath (a drawer full of toothpaste, new toothbrushes, a couple of combs, and some deodorant would be greatly appreciated in a lake home!)

We have a tiny lake home, and the one thing that we need lots of storage for is beach towels and extra blankets. I love to leave windows open to listen to the waves and the loons, but it can get chilly at night.

And showers are probably sufficient, as long as there is a tub somewhere in the house.

Is there anything but the bedrooms upstairs? If so you may want to consider having one bath accessible from the hallway so people don't have to go downstairs to use a bath or walk through a bedroom to access one.