Presumably ypu are getting a very good deal on the shell? say £10,000 would be a bargain. If you had come on this forum with the question "I have £35,000.00 to spend and want to live on a widebeam, what should I do?" Every sensible answer would be to look at the bottom end of the second hand market, expect a boat about 20 years old (when widebeams started to gain popularity) and expect to have to do a lot of remedial work.
You shouldn't be paying more than £20,000.00 for the engineless shell so if your question had been "I have £45,000.00 to spend and want to live on a widebeam , what should I do?" The answer would be similar but perhaps 10-15 years old but again a basic boat with work to do.
There are undoubtedly bargains out there especially in the second hand market where maintenance and pride of ownership can make all the difference between a good basic useable boat and pile of scrap metal but buying one of the former and working your way up over the years as your knowledge of what you want and what is available grows is, in my opinion, the way to go.