Thanks.
Well before I answer a) I am going to tell you about the even cooler diorama tha RON5864 made HERE The other one was cast by mslz22 and may still be available if you PM him. you can see more of that HERE. The other one is from Kotobukiya mechanical chain bases and are available from HLJ. But yeah dioramas are great and I am actually working on a project to double the size of the RON5864 diorama to include an airlock bay door. I have just started cuttting the styrene today. I will post a thread about it at some point. Rons work is astoundingly beautiful and inspired me to try out some stuff myself. Just get some foam board, styrene bits from the hobby shop, some spray paint and masking tape and some glue and you can put together something pretty cool.
b) Yes those are Kotobukiya Gurren Lagann models at least the Daiyaksaier, Kingkittan and the winged version of Gurren Lagann are. They are cool. Very cool. However the winged gurren lagann is a bit floppy and I would have rather bought either the prebuilt version or another version. The Daiyakeier (spelling) and kingkittan get 4 thumbs up. Great kits, very easy to build and very cool.
c) yeah, I love the VE-1 and VT-1 and do not plan to ever let those go.