Just my 2c worth, but if its not a keeper and your planning on selling it on, I would not do anything more - ie mylar removal or touchups....I may get flamed here - but me for buying a project - which heaps and heaps of pin fans out there I'm sure would want to see a beast in her original state, not touched up etc...I prefer to see in her original uglyness.....warts and all.
Or......go the whole hog, send cab and playfield off to Flipper Rescue - spend the cash knowing you'll get it back and have it fully restored.. I'm sure you can do all the electrics and furniture....then sell her for $5 - $7k.
There will be people out there willing to spend BIG $$ getting her back to original glory....
