Since I'm in the process of painting up the new Space Hulk Terminators for my local game store, I thought I might see how well they fit on 40mm bases.
Every last one of them fit perfectly onto 40mm round bases. I tried them all. Even the dead Terminator on the throne fits on there.
The only one that has a small part that hangs over the edge is the Terminator kneeling down. And that can be easily fixed with a trim of his "Hulk base."
Just thought I might share guys.
For a more in depth look at the model, this post has my thoughts.