Although Bigfoot trailers typically sell for considerably more than the usual eggs - I suspect that's mostly due to the higher level of materials used internally. With that gone - the premium is also gone.
Gutted 13' eggs are tending to sell on eBay for something like US$1000. Better than 10 cents on the dollar - but still bad.
From your description it DOES sound to me like you've done all the irritating unpleasant parts already. From my own personal perspective - "repair" work is tedious and irritating. I'm always left with the impression I haven't actually accomplished anything when doing 'repair' work. It's the interior refitting which is the fun part. I'm always left with great sense of accomplishment when I'm doing that.
I'm not saying the perspective is sane - but that's how I feel.
Anyway - Playing around with alternative floorplans and building up the interior is honestly kinda fun stuff. How nice that ends up is only limited by your own abilities. Note: Although I'm quite flattered by Gina's assessment of my PlayPac - I'm honestly not all that good at woodwork.
There's all sorts of interesting cheats to get around what you're not good at though. My favorite (which I didn't use on the PlayPac, but I HAVE used on our house) is using cheap DIY cabinets from a big box hardware store. Although the bodies are built from junk, the faces are very nicely constructed. It's not hard to rip the faces off and build a box that fits the trailer better to attach the face to.
Also - don't underestimate the value of refitting the interior to EXACTLY your desires! Myself as the example: I value a comfortable place to sleep, convenience and storage. I don't value being able to cook inside or having an internal flush toilet (Portapotties are fine).
I would agree with the suggestion that you step away from it for awhile though. Wait, relax, give some thought to the refit and attack it anew in the spring.