You did not say whether you intend to have vane steering or not. It is very difficult (not impossible, I have seen two boats with it) to have both a vane and davits. If you have a vane then a RIB becomes highly problematic. Because of this we bought a Walker Bay inflatable bottom
dinghy. The concept of an air floor is fine since it is light and can be partly or completely rolled up for passages - the Walker Bay has been crap and I would suggest you look at other brands. When we get back I think I will build a nesting
dinghy that I can sail or row or use a little outboard for. I have no need to go really fast in a
dinghy. I just want a comfortable, safe, dry ride.