If you commission a high-end ground up restoration from a professional, you are unlikely to get your money back...particularly in the new age of remake anticipation
If you do the job yourself, it's a lot of work but the sense of accomplishment is immense. I've done a few mid-end restorations myself and it was really gratifying.
Typically the best deal is finding a high-end ground up restoration that's being resold. Resale HEP restorations typically sell in the 8-10k range and they usually cost much more originally.