Hi Jim, so yeah it will work a lot better with those planar pieces combined into just single larger plane pieces.

I've attached an updated model file with those changes in it.

With this version you can just select the whole model now instead of picking edges individually (when a whole object is selected and then Fillet is run it will fillet all sharp edges in the object) and you can go up to a radius of around 0.15 before running out of room:



- Michael