Which parts are missing from this vintage lockset?
I too wish you luck. 

The parts you show are made from 'pot metal.' 

Such parts have a short life in the best of times. 

For older hardware on the cheap, I think ebay,

the ReBuilding Center in Portland http://rebuildingcenter.org/ 

or somewhere from here http://portlandonthecheap.com/homeimprovement.html would likely be your best chance