Ok, the trailer's finished for a friend and here's what I learnt from this one.
Fiber glass sheeting....don't use again.
More bars needed and it won't glue flat.
Crap to cut and it chips even with 60 tooth saw blades. Jig Saw is better but slow.
Composite panel's much better to work with and it gives a far nicer finish. Stickaflex caulking product is perfect for joints and gives a great finish when you can't do aluminium angle.
Use two pack epoxy paint for everything. Sticks really well
Pool noodles are still the best , cheapest way of padding the racks.
Make your own "Z" channels out of 2 pieces of EA for all the doors . Works really well and provides a good weather seal and drainage.
Never use Chinese u shackles with square axels. They will fail. Use 4 bolts and a plate set.