You can try sq and round tables for the tighter spaces. This place let’s you pick a top and base separately…
http://www.seatingexpert.com/products.asp?category=8
This sounds like a good way to take corporate orders. A lot of people getting one pizza may make it confusing if they’re coming in at the same time (dinner rush), but writing down a long order in a busy store is a pain. Something like this should help.