Gotcha, thanks. I'll have a poke around with that. So far I know enough modding to see where things are going wrong (sometimes), but not so much to fix them. Absolutely loving your drone mods and how they add to the game.
I've got a base in the works that uses trains to transport raw ores (mined by drones) back to my main base at a central dropoff. Inside the base, areas are built up in a (not quite) city-blocks setup, but using roads instead of rails. Transport drones do all the heavy lifting between the train depot and blocks, and also for intra-block transport. Belts handle things inside the blocks, with the exception of the mall where that's taken care of with bots.
All in all it's a really nice synergy and fits in the base game perfectly without making any of the other transport methods obsolete.