Haven't been in here for a while, so I'll try to catch up where I can.
1st, the Jehuty is a kit I bought online.
I was lucky enough to find one of the last ones they had in stock.
2nd, the dioramas I post are custom made out of "junk" parts I have laying around the house.
Others are of some of my friends....but it's the same idea.
I just look around for things that might help me, modify them a bit so that they are indistinguishable, and paint. Just take a trip to your local hardware store, and keep an eye out for things that look like they can be used in a diorama.
Same thing used for Pred dioramas:
Hope this helps.