I have been building diorama for about 2 years now, my first one was the Mos Eisley Cantina, and I am not talking about no cardboard display from Kenner, this is an accurate scale replica for the 3 3/4 figures complete with lights in the tables and above the bar, and recently I expanded it with more buildings to create a Mos Eisley street scene as well as the bar. This is a work in progress, and I will be showing this one soon. I have also built a Deathstar diorama, Jabba's torture room, a Bacta Medical center scene, Mos Espa slave quarters where Anaikin was living as a kid, a small Endor scene, and a huge Cobra chemical factory diorama for the G.I. Joe fans out their which is for sale. Oh yeah, I also built a small diorama for my Tusken Raiders to hang out. I am curently working on one of the most complicated one I have made to date. This one should be really cool when it is complete.
My insperation for all these was the great NIUBNIUB. The Master.