I stock & restock, do a lot of upgrade of field version guns restoration work on all sorts of guns. Engraving, checkering,carving, bluing (rust), make parts where needed,
I've posted some of the projects and work here over the years. I don't consider them 'gun building' but rather gunsmithing projects using a number of different gunmaker skills.
As far as making an action like a double square bridge Magnum Mauser 98 from a billet of steel,,,no. That's beyond my machinist capabilities I'll be the first to admit.
I get along with my self taught knowledge and smaller machines quite well for what I do and need but I certainly know my capabilitys and limits. I do marvel at what some others are capable of doing on machines and the work they can produce. I guess I should have paid more attention in 7th grade metal shop class!
Stock work can be either from a plank or from a pre-carve. Depends on whats available and the wood ect.
I don't do rebbl'ing anymore and did very little when I did. Gotten away from shotgun bore work too of late.
Re-laying the ribs on a high grade Ithaca SxS now that someone repaired w/epoxy in the past. I'll re-cut the engraving and then a rust blue restored bbl finish to follow.
The butt stock has been given a period correct recoil pad fitted right to the wood to replace the Pachmyer white line and the wood finish restored to match the rest of the gun. Some mechanical work needs be done yet too.
That's the sort of stuff I get in to.
I don't have much interest in stuff newer than about 1960 or so.
I do make a muzzle loader now and again. Lately use a pre=carve stock but sometimes a plank to start. Have made the lock in the past but generally buy one now. Have always bought a bbl. HArdware I can make and generally do.