It's only Senior Admins who can build, as they have creative. However if you want to build a shop, do it on your singleplayer world, and try to send the shop faction lead (Ryanark at the moment) the file that contains the shop. If its unique and very well built, it will probably be accepted.

F1re_'s Shop 8 Application IGN: F1re_ Previous applications: Italian Language and Spanish Language, Teacher Application, College Professor Application, Black Market Dealer Application (All accepted), Staff Application, denied for not following some requirements, Head Nurse, denied because I...