The tools to do most of the work on these rifles at home are not too expensive.
Brownells vice and wrench
Brownells receiver/bolt lapping tool
Headspace guages
Kuhnhaussen manual
Pull thru reamer kits
Ect ect
For a little more than the price of a new M305, one can have a decent set of tools to keep and use with your friends, organize a boot strap clinic like I've seen others doing, or easily sell in EE to recoup your costs. Plus, it's fun havin the right tools to get er done right and be proud of the rifle you built.