I was originally going to make it out of 12mm untreated pine plywood, but for some unfathomable reason Bunnings doesn't have any in stock. They did have some 16mm laminated bamboo boards though, so I thought I'd give that material a go and see how it is to work with. The individual shelves are just 7mm ply that slide into housings in the walls of the bamboo shell.
This is by no means a complex construction job, and I haven't attempted any dovetail joinery or the like; I tend to suspect the bamboo laminate wouldn't particularly suit that sort of thing. However, it cut, routed and planed easily and cleanly. I think it would be quite unforgiving of tools that aren't absolutely sharp; being bamboo, the long fibres are quite tough and stringy, and if they're not cut cleanly they'll tear. Likewise, the arras needs to be taken off the edges or else the fibres will start to fray and tear away from them in use.
It's quite a heavy material, a lot heavier than pine or birch plywood of equivalent thickness. The laminations are a lot thicker than traditional wood ply too, which I rather like — I find the porous-looking end grain quite attractive. So far I've just oiled the inside and the top and bottom, and the oiled colour is quite attractive. I don't know how well it would accept stain, but my gut says it should be OK. I have no idea about its stability versus warping or cupping; in a piece of this size and conformation that's unlikely to be an issue in any case, and laminated materials, in my experience, are fairly reliable as far as that goes.
I'd say that so far I like it as a construction material. It's not especially expensive, and from what I hear it's pretty hard-wearing (I think it's used as flooring) so it would probably work well as desktops and the like.
Next Day...Well, here's the finished article.
It just needs time for the oil to dry and then I can fill it up with hard drives.
In retrospect, I'm thinking that maybe I should have stained the shelves, but I think I can live with them as they are.