I didn't assemble my Charlie Foxtrot Models' Gladiator Arena last night, but I did take a pic of the pieces. As you can see it's painted and the floor has had sand glued to it and then sealed with a thick coat of satin varnish.
Unfortunately I'm not particularly happy with how it's turned out. That's definitely because of what I've done & not the fault of the model
It won't stop me finishing it though - it's become a bit of a millstone around my neck that I am very much looking forward to getting rid of now. Perhaps when it is finally finished, I'll give it to my nephew for christmas and get another one for myself - I'll know then what not to do when assembling it!