I've used an old edge of an aluminium security door as the bar for the support. Given it a bit of a bend and secured it to the pontoons with threaded inserts just to get the fit right. It's not going to be the final setup but it's giving me an idea of what i now need to do to make it work.
It is attached to the newer rear box I've made up from a chook crate with alloy angle and bolts. If i go this way all i need to do is make attachments to tie the bar down to the yak, possibly a couple of stainless eyes on the deck and the bar to secure with stays. The small bit of alloy is attached from the rear most bolt and "may" go back to the hull to stop any bouncing of the pontoon.
I can also install the bar just in front of the cockpit attaching it to the sail support mount ive made also. Another week or so and it will be test time
