Are the 4000-4400 series good enough lathes to scratchbuild HO/HOn30/N scale model locomotives out of brass?

I only want to make tank engines with a 0-4-0 to 0-6-0ST wheelbase in HO, a wide variety of different locomotives in HOn30, and also a wide variety of locomotives in N scale. The models I want to go for are obscure and weird prototypes that haven't been produced by the big model railroading manufacturers.