Nice project!!
I did this with a Ducati 250... not completely from new NOS parts but about 50% of it, it took me a year of intensive Ebay search to get everything, was not the best idea for my bank account, but the bike is fun and beautiful! i managed to get pretty much everything from 1965 too, with a few modifications
i'm planing on finally get to my SR175 this year, and will hopefully post more details on the build!