Posted a test version 14/11. It fixes a lot of minor issues that I wanted to get past before taking a break from this. Unfortunately I messed with the original map file, and ended up using a copied version of it when I went to compile the mod. I think this reintroduces the "Assertion failed!..." crash on load. The work around of creating a new map file breaks the "start game" button, so if saving over the map file doesn't correct the crash then it's unplayable. Obviously it works on my end, but part of the fun of modding is to share the finished product. I'll see about fixing it if it's unplayable.