Wow... thanks to all for the kind comments :wink:
In reply, it didn't actually cost that much, I'd say in total it cost around €50, maybe €55. I bought a bale of styrofoam sheets, two bags of bathroom grout, some liquid nails(about four tubes) and a tub of non-toxic PVA sealant. Broke up the styrofoam, stuck it into the shapes I wanted, and started grouting. Five coats in total, three quite thin and two thick coats.Then sealed it with PVA mixed with water in a spray bottle, six coats this time. Stuck in a bit of plastic tree and that was that! I'd work on it for a couple of hours each evening in the garage (Kevin let me use his 'man-cave' for the occasion
) and it took about three weeks. The longest bit was waiting for the various layers to dry!
Once again, thanks for the nice things you all posted! As you can see Dennis is happy with it!