Here's a post for the Herald of Discord at Weekly Minis. He's been converting and painting up a set of his Space Hulk Terminators in death company colours and we began discussing basing them. I'm also converting mine (as I don't want them to look the same as everyone elses) mine will be painted up as Flesh Tearers.
First here's the first model I prepped. You can see that some blood angels iconography has been removed. Where there was space around a blood drop to paint a saw blade I left the blood drop - otherwise they were removed.
First I drilled holes for magnets in the model's "space hulk" base. I used blu-tac to hold the model to the 40mm base and used the holes in the 40mm base as guides to make sure they ended up exactly placed.Then I glued magnets into the 40mm base. I then built up the base (depending on the "space hulk" base for the model - for example the librarian is coming down steps so I just wanted the rest of the 40mm to be flat)Finally here he is, attached to his base.
Same pics for the second model.