I am going to disagree with Waksupi on tis one. First a little backround... I wanted to make muzzleloaders just like they did in the old days and I started in my grandfathers shop that was all hand tools some passed down for generations. I have built more than one gun from scratch using nothing for a starting point but a tree limb and a rifled barrel, using nothing but hand tools, a post drill and a forge... all while making my chisels and plane blades from old spring stock and drill bits. I seriously doubt that John Armstrong fails to qualify as a gunsmith because he didn't have acess to a bridgport mill.
The quality of the gun comes not from the tools used but from the skill and dedication of the builder. If all you have money or room for is a mini mill or a dremel drill press it's a starting point. Work carefully and do your best and make each one better than the last. I still use hand tools given me over the years and i know in a pinch if I have to I can do any job that needs doig with two hands and whatever tools I can find or make.
This Leman copy was made while i was moving the shop and all I had for power tools was a cheap harbor freight drill press. 'nuff said.