Wouldn't need much--just different paint, maybe tender trucks (could the logging flat trucks be usable with low wheels?), different pilot (?), possibly different stack on the UP 119/CP 60 "Jupiter" models:
http://www.leviathan63.com/projectYork.html
http://images.wikia.com/scratchpad/images/6/6a/Kloke_Locomotive_Works_-_York_No._17.png
http://www.steamintohistory.com/
Loading, unloading, and steam test runs:
https://www.youtube.com/watch?v=-OqfjV8u63U
https://www.youtube.com/watch?v=_SF2-zwXzII
https://www.youtube.com/watch?v=t4CpVfr-DYE
https://www.youtube.com/watch?v=nCiOXKQ8_2I
Have fun.