That's a very nice, large Medieval city, Giorginetto!
Martin, I too am planning on having a 6' x 18' surface for my Playmobil dioramas, which should be enough room for most projects, but I have some more organizing to do before I can set up all the tables for this. I was able to assemble a 6' x 9' surface, which was enough for my Roman fortress, but did not leave room for the besiegers or anything else.