These are just for inspiration, mind you. I'm not going for copies. I also want to cast them. I'll need a bunch and they are awful fiddly to build each one. I'm going for a modular concept so that I can mix-n-match parts to give me variety. Then I can build more styles later and incorporate them into the existing scheme. I'm not doing a full documentation as the basics have already been covered. Here's where I'm at so far.
Hull construction: Starting with several shells with the same outside dimensions, that way the other components line up.
Where I have a slope, I just built it square, then trimmed it square when then angles are in place:
This is a lot easier then calculating anything.
The track units will be built in pairs with open mold casting in mind. I'm making them able to be reversed or inverted to get as many different profiles as possible. My goal here is to seal them up so they will be a one piece cast.