Aw hell, this mod modifies the collision mask. It breaks the upgrade planner.
I don't have a great solution, but I have a solution. Version 0.1.1 will not auto-upgrade, but you can manually program an upgrade planner to use the new version. Will release shortly.
Another solution would be to modify the original agri tower at a later time - I'm not sure if data-updates would be enough, or if you'd need to put it in data-final-fixes, but that would solve the maraxsis incompatibility without affecting upgrade planner usability.
Unfortunately maraxsis modifies the agritower in their data-final-fixes. I definitely do not agree with that choice for this reason, and it's forced my hand.
The only alternative would be to make maraxsis a dependency [optional] of this mod giving me the chance to run after their mods... but I feel that's just dirty. Anybody else could do the same thing and I am not playing a game of whack-a-mole.