This company can help you with all of your brake needs, including relining your shoes and turning your drums.
Specializing in antique, vintage, classic, obsolete, unique and hard-to-find brake parts, bonding, riveting, rebuilding, drum and rotor machining, custom made brake hoses
Brake Materials & Parts Inc
800 Sherman Boulevard,
Fort Wayne, IN 46808
260-426-3331
http://www.brakematerialsandparts.comSome Auto Zone and NAPA parts places will still turn drums.
For mounting tires, find a shop that works on delivery trucks and semis. They know how to handle two piece rims.
I'll second Jerry's suggestion about staying with drums. Properly serviced and set up, they will offer superior stopping power to discs. Dump trucks and semis all use drum brakes.
It will also be cheaper and less time consuming to restore what you have than to re-invent a complete brake system.