Wow, Max, that is a big project to take on.
I also echo what =CB= has said, it's usually the project that experienced builders take on & can take a long time to complete. But that said, I support your enthusiasm for the project & I am sure that whether it gets done to your satisfaction or not, you will learn a lot about guitars in the process.
Your opportunity to work with a violin builder and use their experience, tools etc. is great, because as anyone who has researched the history about the L-5 will tell you, Loar got a lot of the ideas about the archtop guitar from violins and cellos. Both you and the violin maker will learn a lot from this work, so it's great you can be an apprentice of sorts. Maybe after that, if it all turns out OK working with them, they may consider taking you under their wings and doing more projects, or even formalising an apprenticeship?
I must say that it is a huge opprotunity for you, Max, and I wish you al the best in the work. :icon_thumright:
In their day (1950s), a D'Angelico was more favoured over the electrified L-5. There was a repair 'documentary' that was on one of the other guitar forums (TDPRI?) that had a repair job on a D'Angelico stepped out, and done by one of New York's master luthiers. The luthier now was in semi retirement in Italy, but came back to the USA occassionally to see family and do a little repair work. On that occassion he let a friend photo the work as he did it and repaired/restored a D'Angelico that had seen better days. The surprising thing about that was the lack of bracing involved for such a huge sounding guitar - which suggests that wood selection was critical.
Gibson still make the L-5 in electrified form, and also re-issue a 1934 acoustic version too. So there would be plans around somewhere.