In a fit of DIY enthusiasm, I once bought the plans for a Fliptail self-build folding boat from these people
http://www.woodenwidget.com/index.htmlLuckily and after making a realistic assessment of my DIY skills, common sense prevailed and I bought my 3D inflatable. However, some people might find the idea of a cheap, folding and lightweight (15kg) dinghy interesting. They have several different plans, some of which (the boat not the plans) might even fit into a BR locker or down the side of the centreboard.
Given the amount of faffing about involved in inflating and deflating a dinghy, I don't think I would want to attempt the deflation bit on board. So on the whole, once my 3D is inflated it stays that way and if necessary is towed behind my BR. However, because it is so light when empty, it does tend to flip in strong winds. Quite often, it will flip back again without any need for intervention. It tows quite well upside down!
The certification plate on the 3D transom states that tubes should be inflated to 0.25 Bar (4psi). However and according to Seamark Nunn, who have it direct from the manufacturers, the floor should be inflated to 0.7 Bar (10psi). Not many people know that....