Bill,
There is something just plain wrong about building two large planes simultaneously (and having the space in which to do it).

So right now, the P-47 wing weighs more than the unsheeted Simla?
I'm making good progress on the fuse and was getting ready to finish drilling the various holes in the firewall so I could epoxy in the formers. Which brings up a question: Did your kit contain the nose gear mount or is that something we pick up at our friendly local hobby store?
My new tactic with getting a flat, smooth surface, at least with the tail feathers, is to apply a bunch of filler and then scrape it away. Any that remains is filling a low spot. No doubt it's adding a bit of weight, but it does help diminish my frustration level and lets me carry on with the build.
I have to admit, the fit of the parts in the kit is nothing short of amazing. I figure any errors are almost certain to be caused by me.
Cheers,
Richard