Rifle build...
Crimson Dave--He wants to build a rifle as a "starter"? As a learning project? As a hunting-but-not-target-accuracy piece once it's done? Hey, we all have to start somewhere! And it certainly will keep him out of mischief for a while.
Gee whiz--That's easy! He should get a milsurp--I'd go with a Mauser for quality and a Yugo M-48 for the bent bolt handle, if possible--but NOT one that has historical significance. Then he starts by removing the stock and other non-essentials, and gets busy building his rifle.
A milsurp won't cost an arm and a leg, they're built like the proverbial brick pizzeria, and for most of them, things like sporter stocks, Timney triggers, scout 'scope mounts, etc, etc, are readily available.
Shotgun News usually has ads for milsurps; he could start looking, there.
Tell him good luck, and we want a progress report, with pictures!
ETA--My report on my project is here:
www.thehighroad.org/showthread.php?t=433568&highlight=Sorta-bubba'd
P. S. Major Dave--I didn't "know anything" about building a rifle when I began my project, either. It was a great learning experience.