I have just built a set of wheels using a hope s/s hub on 717 rims and with a sprocket fitted the fugging thing was heavier than my old wheel which was a 717 on a DMR hub with a WI freewheel ( by 30g according to the wifes kitchen scales)
actually you could make some out of hulahoops and put some bubble wrap as pretend nobbly tyres on them and paint them black add stans stickers etc. that way they would look like 29er wheels, be light for carrying/hanging in trees and make you look niche all in one go! Winner 🙂
Put the spend into some nice rims and spokes. Don't worry too much about the hubs.
355/Crest/717's on the outside and DT supcomp/revolution or Sapim CXray holding them up.
DMR revolver hubs are quite light and cheap and shimano DX freewheels are OK if you keep oiling them