So I've built a small test level to learn how constructor works. It's decent enough, but now my question is how to get it as a level? I've read to make it a dif file and load it in the level editor, but I can't get any interiors to appear in there. What steps do I need to take?
Welcome to the future of marble based entertainment.
To convert your map, you're going to need to use map2dif, a free tool that you can find here
in the "Extras" Downloads section
(should be at the bottom).
If you use windows, you should place your map and the exe in a directory with all of the textures (presumably the interiors directory), and drag your .map onto it the exe to run.
If you use Mac, you can just get the GUI tool (made for lazy people by/like yours truly), place your map in a directory with all of the textures, and open it with the program.
Hope that helps, let me know if I need to clarify.
PQ in a nutshell