Have had the proa in the garden and experimented with the how and where I will sit. Tried the trampoline but far too flexible and uncomfortable. Tried just using beams but this would be too hard to move around. Finally as pictured two alloy tubes (never throw anything away have dragged these around with me since the 1980's) and a old but never used garden gate. Have purchased (£9.99) a folding hiking seat (blue thing) and this feels just right. Just sitting in the seat I get great vision of how it will all be completed and that the design is spot on.

Have also been sketching some ideas around improving the steering further and the idea off adding a tiller to steer - many ideas more to follow......