For those that build profile modles ai'm wondering what the consenses is on hom much sanding I should do. Do you sand the doublres to meet the fuselage with a smooth flush fit or do you just leave them as thge are and just break the edges? So far I've been sanding for about 2 hours.

Sanding the doublers on a profile fuse has more importance than cosemetic. If you leave the doubler blunt, it creates a potential stress point on the fuse that can cause problems with cracking and failure. I prefer to sand a nice long bevel on the doubler before I laminate it to the fuse blank. This creates a transition area that eliminates the edge. Think it terms of the nose with the doubler being really stiff, then in a very small area you have soft balsa, it creats a "hinge " area at the back of the doubler.when you taper it , it creates a much broader area to absorb the stress.

Be advised, I am trying to explain this as simple as possible I hope it makes some sense,,, bottom line it just isnt for pretty

Jim on your next profile take the doublers to your benchtop disc sander( before you epoxy).  Make sure you mark both the outsides of the doublers. Dont ask how I know. You can take the sharp edge to a nice taper. I take mine about a inch or so. Makes a nice smooth transition. Dave R

I use a table top belt sander, I position the edge of the plywood right at the edge (the side)  of the belt, I can make a perfect feathered edge in about 15 secs. The balsa is off the belt, so it does not dig in.