So, I hit both replacement frames with a light coat of flat black paint:
After 30 minutes of drying time in my wife's empty outdoor planter, they looked pretty good:
Here's the kitchen table work area:
I accidentally snapped the bend on both little brass stanchions to get the pipe off the original front frame, so I used super glue to hold them in place on the replacement:
I only replaced the front frame (left truck in the next 2 pics), as the back frame is still holding its overall shape fairly well (I greased all of the gears, too):
I think semi-gloss black might have been a better paint color choice instead of flat black, but from a few feet away it isn't very noticeable:
I will get some run time on my PRR 4866 tomorrow to see how it fares. Stay tuned.
Also, I can't thank Henning's Trains enough for tackling this project!