In evaluating crape myrtles, I have a personal dislike for the form that most of them end up being. They start as skinny 4-prong multi-trunk trees growing almost vertically. (They are staked this way by the commercial grower.) They are then beheaded somewhere around waist or chest height, purely for the convenience of the one maintaining, as no ladder is required. If later allowed to grow out some more, they end up looking like this: I think a much better shape is this: Sizewise, where the canopy clears a human head by a couple of feet. The good news is that it is possible to convert the the former into latter, but it requires a complete rejuvenation, i.e., cutting to the ground and regrowing, this time paying attention to the form, which is not in the least difficult. It only takes a year or two to establish the new trunk arrangement, and another 3 or 4 years for the canopy to become full. But in the in end it's totally worth it for having a much better looking tree from then on.

I have no idea but I will say that is the worst possible place for open shelves and without pictures of the space I for one have no clue as to size . BTW there needs to be proper support for those too.

You might be surprised at the miracles the pros here can work with complete information. If you are putting in new cabinets you may be able to shuffle appliances around without any added expense. As far as materials are concerned you will want to stick with the retro look if you are keeping the tile. I hope you are planning to have the tiles thoroughly cleaned and re-grouted. Other suggestions would depend on budget and square footage.

Sometimes setbacks are measured horizontally, sometimes setbacks are measured along the surface of a slope. If they are measured along the surface of the slope, you have more space than you think. That is why I asked, "Find out if the 100 feet setback from the Ordinary High Water Mark (OHWM) is measured horizontally or along the contour lines?" If Mt Hood is directly south of the proposed house, it would make sense to make the south facade as perpendicular to the line of sight to Mt Hood's summit as possible within all the constraints; it appears there is room for some rotation of the proposed house on the site. That is why I asked, "Is Mt Hood directly south of the proposed house?" It may be advantageous to locate the living room area front and center without any living space (deck) between it and the view. This will keep posts and railings from distracting from the view. It is nice many times to have the outdoor living space adjacent the indoor living room space, but in this case the deck may be better located off to the side, still maintaining its view of Mt Hood. If you have not already, visit Timberline Lodge on Mt Hood for some inspiration.