I've done the basic assembly of the 4Ground tower, including my new roof - which is, I think, looking pretty good. The 'tiles' on the roof apexes are actually little sections cut from wooden cocktail sticks of all things! The roof needs painting now, and I need to decide how much other detail painting I'm going to do. I sort of feel as though I 'ought' to repaint the woodwork in a greyer, more weathered-looking, colour, but I find that I actually quite like it the way it is.
As far as assembly was concerned, it was pretty straightforward. I did find that the 'cuts' were a bit tapered (presumably the laser burns more from the top of the 'cut' than the bottom, and the thing fitted slightly better if I gently dressed the cut edges with a smooth file. I'm not sure that was strictly necessary - it'd probably go together fine without doing that - but it made me feel better. ;-) It was a fun build. It's an ideal war-gaming piece - it stays in found pieces when finished - roof, top floor, middle floor and 'basement'. I am toying with the idea of adding some embossed plasticard to the base with a more random stonework pattern, but am not sure I can be bothered, or that it'll make a big enough improvement to the appearance to be worth the effort. Anyway, with the thing being 'modular', all the possible changes can be left until/unless I decide they're needed.
I think the roof is going to be a sort of terracotta colour, as seems fitting for Roman tiles.