Have you had a chance to weigh them? I'm curious what the weight is compared to the wood ones.
The wider 375mm platform weighs just under 8kgs and the narrower 320mm just under 7kgs. They are both 2.3m (7' 6-1/2") long. That is with 9mm marine ply as a platform and no slots. The 6mm ply is 20% lighter so if that works they should weigh around 6.5kg and 5.5kg. I should be able to get that weight down with a bit of tweaking (cutting slots, tapering the ladder ends, cutting more holes in the ladder strings etc. Just have to see what's worth doing for the benefits.
I take your point about their position for camping but I find I empty the round hatches first of gear. We carry all our bivvy's, sleeping mats, sleeping bags etc in one large doubled drybag stored on a tramp.
The front hatch is still accessible. Ultimately I have a 4 platform system in mind for the TI and that would be centred over the hull.
BTW- That haka table looks great!
7' long hakas would seem to be adequate to support a tent or bivvy (Stringy's are 8').
I gave you a bum steer originally with 2.4m. Each section is 2.3m (7' 6+1/2")
Given that he now has the capacity to do it either way, maybe Stringy will do a comparison and share his experiences.
You can count on that!