hopefully here's a decent pic of my original rack
If you can afford it get the pipe that "welds" together with the appropriate plumbing adhesive, I've found with hot glue they tend to come unstuck after several months
I did an experiment with a smaller version, I filled the gaps around the pipes with that expanding foam, then sanded it all flat once it had gone off, then I filled all the little air hole in the foam with a 2 part Auto body filler ( it only takes 5-10 mins to go off) then sanded that nice and smooth and painted it all
thought I had a pic of that but I don't but it's not that hard to imagine
the angle of the cut is about 30 degrees or so, I also made a jig for my chop saw to cut the pipe quickly
the black piece of mdf to the left of the pipe swivels round to clamp the pipe when cutting, 'cause I aint putting my fingers that close to a spinning blade