@spikeyxxx Yeah, it seems that one of the toes did not bool correctly (even though I checked) and I haven’t been able to fix it, so I’ve just left it in there for now.
A fun fact that I discovered when booling (in this case Union) is that the absolute dimensions, not scale, of your object matters. Originally my model was about 1,65 meters / blender units tall as that was the height of my reference. When I started booling objects it would rarely go well, until I scaled my model about by about a factor of 5. At those dimensions,nearly all the bools worked perfectly without a hitch. It’s probably due to the distances becoming too small in whatever algorithm booleans use behind the scene.