Just a suggestion; you might want to post those photos over on TrainOrders.com. I just noticed that, on RYPN, the man from Denmark inquired about why all new crankpins and such. I refuse to participate on that RYPN site, so am unable to answer his question from a technical standpoint.
For what it's worth, new crankpins are REALLY necessary since there is no telling how many times the existing crankpins had been resurfaced/turned undersize. Also, the installation of all new crankpins, made to original Union Pacific drawing specifications, will insure that ALL the drive wheels will be PROPERLY turned to the exact same diameter and perfectly quartered. Such dimensions insure proper valve settings when finally assembled.