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One of the plusses of making a PVC box is that it's easier to grip than HDPE, where you have no edge to scissor on.
Sky.One word My friend, LEXAN.
Also as far as the first pic in the op. Put your supports on the inside. the less shit you have sticking out to eat it on the better.
Just make the top of the box, then add the legs in. Throw a bottom rail or cross brace if you want it to outlast your house. Some ply on the wides isn't necessary but you can use scrap sections. Can cut holes in those with a jigsaw for moving it around.
And as somebody mentioned if you get a nice topsheet def use coping. Actually with any flat topsheet. Pvc tubes you don't need to because they're round. Unless you want to shave in when you grip the edge.
You don't even need to weld it. If you're going to use coping figure out what size. Add a 2x4 dropped down the height of your coping+ topsheet. Drill it to the frame, bolt the coping to the frame. Add the topsheet, enjoy.
Leaving a little room between the hdpe and coping is generally a good idea as well.
You can build a rock solid box that slides as good as the ones at resorts for not that much money and with normal power tools like a drill and jigsaw. A miter saw is nice for using angles in the framing, straight cuts, and being fast but not needed.
Measure twice cut once
TcluffWhat should I use for coping I am putting an hdpe sheet on my box but I forgot about coping should I use pvc pipes or steel bars? Or is coping even necessary?