Build it in 4' x 4' sections, and use 3" u bolts that are flat, not rounded, at the bottom of the u. That way when you drill a hole just inside of the outer 2x4 support, you can use that u bolt to connect 2 platforms that are side by side. When done, pull the u bolts out, and move the 4x4 sections outside and stack them. Much easier to move at that size. you might want to take a router and cut a channel from the hole to the edge, so that the u bolt will be recessed when the platform is assembled. I hope i am clear enough on this, if not ...pm me and i'll try to explain better.
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