fabricated a lugged frame in the 70's with out much more than a bench vise, and some Borrowed heat and the local Community colleges rosebud torch, (metals arts casting machine) to get heat to do the fork crown mass..
happened to Visit thru Nottingham 15 years later , as a traveler on a bike I was the guest of a man there who built frames for pro level riders , without much more than the torches to make the heat,
a wall of half round files and a bench vise in the basement of a 300 year old English house..