You could start with the Ric book, but remember the vintage basses have the early truss rods which were great, but my 72 did snap with the roto rs66's. There were several periods where neck profiles were thick then thin (my 72 is very thin, but similar to some of the recent thin ones). A lot of the 80s and 90s had "baseball bat" necks that were very chunky, but again I'm sure there were a few thin ones in there somewhere. Some of the recent 4003S models have been outstanding in my opinion, but as others have mentioned inconsistent. You may get a great one of those if you search and try a few out. In 1971 I ordered a 4001s and got a regular 4001. They offered to send it back and ask for another one, but after waiting almost a year I took what they gave me. It wasn't even the color I ordered! So even back then there were some wacky things going on, but I love the company, the designs and the people who play them. Good luck and let us know what you end up with!