Easy to regauge. 40 minutes' work using Accurascale's Deltic P4 wheels on the original axles.
Alternatively, there's enough meat on the IRM wheels to turn down the width and flange depth on a lathe.
Q-Kits did acquire an unenviable reputation, much like MTK, for the irregularity of their component parts. I remember them mostly for their 1980s attempt at a USATC 0-6-0T kit, at a time when there was absolutely no alternative available.
My ideal list would be:
- one of the Caprotti 400s
- one of the 500s
- one K1
- one K1a
- the sole P1 2-6-2T
- a J26
- possibly the VS
...and obviously CC1. How could you not have that? CC1 would be a massive study aid for alternative fuels.