I don't get it. but I'm fairly new to model building. I don't buy "kits" to build. I draw plans of the car I want; buy some sheets of styrene and aluminum, plus some styrene tubing and glue. Then I build what I draw and try to make it look as close as I can to the real thing. I have been calling it "scratch building" but now I'm not sure what it is, other than fun to do. When you can build most anything you can think of, that's fun stuff, to me. It's not that difficult, with practice. There's several other guys here that do the same thing I use to build buildings and stadiums and custom homes. They didn't come in a kit form. Was that scratch building. It's not much different than making one of these models except more pieces and more money. Here's one I'm "scratch building" now. What should I call this kind of building.