STAR WARS MODELSSSSSSS

I want to get some Star Wars models to add to my other SW stuff. No, not to just put in the cabinet in mint condition boxes. I want to build some stuff to display. I dont want toys, I want models. I really want an AT-AT model, but since its a BIIIIIIIIIIG vehicle, I want the BIIIIG version of the model. Yes, the 15" version and not the 8" version. If I have to make the parts myself, so be it. It will be a first, but I want it. I just need aloooooooooot of help. Star Destroyers, and big icons that had me in AWE since I was little. Any help finding or getting this stuff will be apreciated.