A company called Bussi made aluminum rims in the 30s, as did Ambrosio, Fiamme and Mavic. I doubt you would want to ride any rim, aluminum or wood from the 30s as their safety would be questionable at best. Fiamme Sprint rims from the 50s can certainly pass as period correct, they are hard to find but they are out there.

For hubs, I think your best bet is English - Brampton, Blumfield, Bayliss-Wiley or Airlite are still out there. If you are lucky, you could find some Simplex or FB hubs. I have 2 1/2 sets of prewar NOS FB flip-flop hubs, but I'm not going to give those up anytime soon.