Actual carpentry!!
See that? It's bits of wood, attached to other bits of wood! I'd heard it was possible, and what do you know? In my very own garage!!
So, words of advice for young people. When you're buying Masonite, and you have a ute, and you have a stack of ply on the ute, and the professional timber salesman says "Oh, just put the Masonite on top, that's easier.", tell him politely to shove his broken, splintered Masonite up his arse. But hey, it was only the shim layer - I had the lumber yard rip it into "top" and "shim", and the top layer was safely under a stack of ply, where it couldn't catch the wind and snap. Just saying. I was going to cut the broken pieces, but then I figured since it was an undercoat, as it were, I could just jam them together. Yippee.
More wood, joined together. It's amazing, isn't it? I haven't decided whether to give it a front lip or not. It'll get lips on the sides and back, to stop things like brake master cylinders rolling off. But I think a front lip will just annoy the hell out of me. Thoughts? It will, at the least, cover the ugly holes in the front.
Apparently they call this a "nail". There's a whole lot of "liquid nails" under this sheet, but I added a few solid ones to hold it all together. We shall see.