95% of Saturn's MX5 chassis is identical to the book.
I started with one of Handy's standard flat pack kits, and have only had to change/replace a few parts for the MX5 version.
I'm sure if you talk to Handy nicely, he'll come up with a plan to get you started - he's been a great help for me
It'll save you countless hours starting with a pre-cut kit - well worth the small premium!