It's done! For a change. Hope I'll paint it on time now.
Almost done, to be precise - I kept the guard off for now, as it's mostly transparent and I don't want to get paint on it; and I need to sand down some filler, but the build is done.
Here's the guard - I just could not find mesh of a suitable size, and had no time to order stuff, so I chose a transparent guard instead - another small plastic box with some plasticard added to cover a trade name. This will have the brackets and the white strip painted.

I added a somewhat over-large embossed logo on the base - these are self-adhesive letters intended to decorate handbags or something. HA stands for Hydraulics Amalgamated.

I also added the ram for the lower platen, another seal ring from a TT Combat paint. Interestingly it has 'press' written on it, so it was meant for this build! the daft engineer installed it upside down though...
And finally, here's the complete press, with the guard in front of it. This will go on the front side of the press, more or less at the operator's height.

I have to confess I hadn't thought about designing platens when I started out, and this took more time than planned. The clay in the plastic box shrank on setting (well of course it did, it's what clay does), so I had to seal it with filler, and clean up the two platens too. They are nowhere near as polished as the real thing, but will do.
I had planned an orange paint job but nostalgia for the old presses in the sink factory I had worked in means it will be a very traditional machine tool green. I might make the letter red, for some nice contrast, and the platens were colour coded, so the sides could be any colour. I will have to have some oil leaks, but will try not to overdo it.