It, should be noted, that I am not, building this as a residence, but, as a recreation/utility building, for my entertainment and pleasure, Just to look at.
It, should be noted, that I am not, building this as a residence, but, as a recreation/utility building, for my entertainment and pleasure, Just to look at.
Since you are just doing this for something to look at, I understand that you are not building it to any code. A few things that you might want to do before you get too far into it is to use bolts on your floor joists where they attach to the posts. Nails are not structural and will not hold up the weight of anything. Bolts drilled through the boards and posts will last forever, nails will pull and bend over time. You can also add Simpson brackets that are designed for what you have done like you did with the joist hangers. I would also double up the boards that you have the hangers on. There is a very large load on the middle of those boards, between the posts, and if the likelyhood of cracking or spliting is very high at those locations.
Looking at your latest pictures, I would sister on a 2x12 to the outside of those boards that starts at the back post and out over the water, to create part of your deck. This will both give you a solid platform for your deck, it would also double up your floor joist.
With just one top plate on your walls, you need to do something to keep them together at the corners. Every building moves, and not having anything overlapping on those top corners will allow more movement then the building will be able to take over a short period of time.