I think trying to fillet the rails won't work as its a chicken and egg thing. You need something to fillet in order to get the right geo. You can't get the right geo with the rest of the geometry defined. You really have to complete the airfoil curve first. I do use a lot of filleting in the models, just not at that step. This is the reason I'm looking for a good solid, otherwise the filleting doesn't work out. Or the boolean ops. To make the hub and so forth.

I plan on checking everything in detail once you get further along.