Personally, if it is a 998 it will be easy to find a replacement engine for easy money in good condition. At least then you can tinker with the old one yourself without any hurry to get it finished. the rest of the stuff apart from rust, is cheap to do and easy to learn. I would suggest you try to do as much as possible yourself, as garage services can be pretty expensive at around £40/£50 for an hours work. And the bonus of doing it yourself is that you will know everything about the car when you have issues in the future. At 16, my son was given a Mini shell and boxes of parts, new and used and he built it up ready for his 17th birthday. there is now pretty much nothing he cant handle in the way of repairs.
If you need help, PM me and we can meet up and have a chat sometime.