Made 2 of them. I remember being amazed when the first one cracked out the mould. I had a few pin holes on the surface so I clear coated them, about 8 coats! No pics of the pattern I made I'm afraid. I made it from 2mm steel plate welded into shape. Then I made the classic mistake and used rattle can paint. Then I read on this forum about the problems of doing that and before I used it to make the mould I stripped the paint off and used polyester resin (another mistake!!  haha). I was very lucky and got away with it tho.

The tube was too short for what I needed, so I bought 2 lengths, butted them together and overlapped another bit of the tube, glued it all together with high temp resin (Easycomposites). My bracket was slotted into/thu the can so it was supported from the inside. I can't measure the thickness of the tube now but I remember it was really thin,  must have been less then 1mm thick. Before it was all bolted up I was skeptical that it would be strong enough but it was.