Even full time at a professional restoration shop with 2-4 guys/gals working on it 4-5 months is a pretty tight schedule.
If it can be done that quick I'd question if they/you can get all the details right, the details that help the truck last another 50 years and not just 5.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-