Very cool, will follow this with MUCH interest, as I have been planning for a similar project although I had thought about basing mine on a 65 Chevelle just because I have an extra. I have reference photos and some measurements from a junker I have amassed. Too many other projects ahead of this one! PM me if my references can be of help to you.
The Buicks are greatly under-appreciated in the collector market, IMHO.