"Another candidate is the Lionel T-1...the boiler front would not require repositioning the bell, light, and it has no number boards to remove...but it would require quite a bit of added piping, injectors, etc.
Operational wise, the MTH has the can motor vs. the Lionel Pull-Mor."
If I may intrude - or protrude - into your thought processes one more time, the can motor will operate better in general that the Pullmor - especially if you upgrade with ERR Cruise Commander (I recommend; straightforward). You can't have cruise control on the Pullmor AC. Having said that: the Pullmor can run quite well, and they tend to get better with age, so long as they are not worn out. The gearing on the RDG T-1 is pretty good - I have the Mohawk "version" - same drive train. Also, I am attempting a streamlining bash right now, employing a Lionel ATSF (really NYC #5344) Warhorse Hudson - with Pullmor and TMCC. Runs well. Noisy. Some are, some aren't. My Mohawk was converted (by Timko) to a can motor and ERR Cruise Commander. Great runner. The 5344 may get that, if and when...
The small details that you mentioned (added piping and the like) is actually the easy and fun part, as I discovered a long time ago. Getting the Big Basics right is the pain. Correct proportions are important, and a project does not have to get everything small right - so long as it gets nothing big wrong. If that makes any sense.
I don't know much about the CRIP, but they had some impressive 4-8-4's, and more than anyone else, I think. They, the CNW, the MoPac and the Frisco need more O steam models around, especially 4-8-4's and Frisco 4-8-2's.