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listen to ^him for the dfd i built a huge fdf like that and it would be so easy to set up as a dfd real sturdy too even though the supports would be at an angle if its on a downslope. make sure you have skirting though just to help keep it all from shifting when you hit it.
for the rainbow rail or box whatever you were thinking about i think your best bet would be to get a stack of strapping (they are like 1x2s basically really flexy) and then i think i would stack them on top of eachother so that it would be easy to bend. my dad and I used this for our boat cover frame and when you stack 2 or 3 on top of eachother its just as sturdy as a 2x4 but you would be able to bend them and shape it how you want. I was thinking of building a rainbow rail or whaletale last summer, and i thoguth that this would probably be the easiestway to get a good shape but not have to invest too much time. if you wanted to build a box then i think it would be better to make a really stable fram with a lot of supports and then cut some plywood to shape it since most of the weight would be put on the 2x4s of the frame. i think it depends on how much money and time you want to spend on the project but also whether or not you want a rail vrs a box.