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TcluffThx I've seen people glue coping on does that work pretty good?
theabortionatornooo. Don't do that.
Your best bet is to drill and bolt them. See what you can find for steel and take that into account when building your box. You can leave an offset on the sides the height of the coping. If you don't want to do that or already have a box you can simply throw a 2x4 on each side, dropped down the height of your coping.
Make sure you get the height right. If it's high or low it changes the way everything will slide. Also boxes where it goes from one to the other suck. Your speed and the feel changes as you go from all metal to all topsheet.
Welding a feature is the best way to do it, but that's not realistic for most people. With some 2x4s, a little bit of ply, a miter saw and a drill you can build a pretty fucking rock solid box though.
If you absolutely can't find anything else you could use pvc, but imo that so of voids the point of buying the hdpe in the first place.
If you spent the money on that, worth it to have steel sides.
How thick is your topsheet? Make sure to counter sink your screws a bit. If you bought thin top sheet be careful. You need the head under the surface so you won't catch it, kill yourself, your ski edge, and rip up the top sheet. At the same time if you drill too deep, the screw/bolt won't have any material to grab and might rip through which probably won't harm anything, but it won't be holding down the topsheet.
TcluffThx helps a lot.
Also my hdpe sheet is half an inch thick so should I use half inch coping as well?