Your missing one important factor. If the property at shore is private property, when the water goes out, that land is now theirs and you would be treaspassing. Wisconsin water laws are based on shoreline, not high/low water line. Depending on what shore your hunting, some land owners aren't that friendly towards us hunters.
As for the rest of your questions:
1)If your layout is on dry land and your hunting out of it as a ground blind your fine. (I have done that and been checked by a warden and he didn't say anything) However, make sure it's dry ground, not very low water.
2)Also done the neo tub, sounds like a great idea, but didn't work that great for me. I was in about 4" of water, more than 500 feet from shore, but had alot of problems with it floating and bending the frame of my ground blind. Thought a better idea was one of those large plastic sleds at fleet farm, but haven't tried it yet.
Again, depending on where your hunting, I would not advise pulling your boat up too close a house. If you have more questions, pm me and I will try to help.
There is room for all of God's creatures, right next to the potatos and gravy.