Hi Jim, I've attached an updated version of your model that has those gaps repaired in it.

I fixed them by deleting these faces here from each side:



And then building a new surface there from the 4 surrounding edges using Network, and then joining those to the main body which then gives a solid with all joined edges - this version can now be filleted:





The above is with a fillet radius of 0.04, tha'ts about as high as you can go before some of the fillets in the narrowest area start to collide into one another.

The sharp corner does get filleted, but the corner patch there is a bit funky and lumpy, it's kind of hard on the filleting mechanism to handle sharp corners very well.

- Michael