I just used the bigger high strength tie wraps to hold my plywood platform on. Then screw everything to the plywood. I've put 7,000 miles trailering the machine and the plywood is still there
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@oldfortyfive, I've used nylon-ties for years holding boxes, crates and platforms on my ATVs. Decided to do the same with the P5.
Since I'm not a metal worker, I made the box out of 3/4" plywood on the base and 1/2" sides. The aluminum box is screwed into the plywood.
I ny-tied the box to the rack in 8 places. I like using the nylon-ties because I can remove the box in a minute if I need to get under it.
On one or two occasions, I have had the nylon-ties break after major abuse. I can tell when a tie has broken, as the box gets alittle loose. I've never 'lost' a box. To counter this, I sometimes use heavier ties. For now, I'm using inexpensive 6" ties, doubled up. I don't see 16 of them breaking. I prefer not to drill through that beautiful Honda rack.
PS: I really like the idea of putting on DIY cargo trays. Everyone's needs are different and you can make a rack that answers your specific needs. PLUS, when your needs change, you change out the box. My rack cost about $7.
Al