I looked at all the 356s at last years Arizona auctions. While I didn't analyze actual selling prices (only the auction house's expected selling price range) people expect a lot of $$$ for cars with obvious defects let alone repro trim. non-matching engines, etc. In a good market you should do well although an investment of $10 or 20k might pay off if you are so inclined to put in the extra work. The Arizona auctions run next week so we'll see where things are headed. I should have bought that $100K project Speedster a couple of years ago