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Step 8Skinning the underbelly
A suitably large piece of folder plastic is cut out to go around the curve, up the straights and over the top to form a ledge. Hot glue the whole lot together again.
The big cylinder at the back end of the gun is about 165mm in diameter and 200mm long, which is about the size of a 5 litre house paint can (which I found in a skip). After you've cleaned it out, cut a 75mm hole for the barrel to slide into. Again, it's not centre but is relative to the oval shape being in the centre of the can. I cut it out by drilling lots of holes in a circle and punched it out.
The big cylinder at the back end of the gun is about 165mm in diameter and 200mm long, which is about the size of a 5 litre house paint can (which I found in a skip). After you've cleaned it out, cut a 75mm hole for the barrel to slide into. Again, it's not centre but is relative to the oval shape being in the centre of the can. I cut it out by drilling lots of holes in a circle and punched it out.
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It's technically 700micron polypropylene sheet. It's not very rigid, no, but the skeleton structure underneath supports it and gives all the strength you need. Like sheet steel over an aircraft fuselage.