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how would you get one long piece tho? unless its the actual board that goes on the wall, which still would be too short, you wont be able to have a clean setup...other than that, it sounds like a pretty good idea
I wouldn't do it. I had to take apart a bunch of dry erase boards in my job this summer and I dont think it will take the abuse your skis will give to it. I think your going to catch an edge every single time. They aren't that durable and will prob deteriorate from water. Search how to build a box, or something along those lines. I have a thread in there with a bunch of info. A bunch of pvc pipes works well and its very cheap.
if you plan on having it more than 6 in off the ground, you'll need speed and you'll land like halfway down it...8 ft isnt very long at all...and yes, it probably will break under weight, although the wall boards seem big, so maybe if you put wood under it to reenforce it...idk. how would you go about getting it tho, stealing from a school would be tough
if you can get ur hands on some puckboard, that works. my friend's dad worked on a new hockey rink, so now my friend has a whole ton of that stuff. He's planning to make a 16 ft rainbow, 4 foot rise with it, just trying to figure out end heights and stuff now.