[Arran]

I don't know, if you happened to find a model 95 chassis they were housed in the highboy cabinets as well, the performance between a screen grid TRF with push pull #45s, and a superhet with push-pull #47s is not going to be that noticeable, the audio quality may even be better with the prior. I can't remember if it was the model 95, or the 96, but at least the latter had an automatic volume control, which prevents being blasted on strong stations, which is the main complaint most people have about TRF sets. The only real advantage of the 112 is it's more selective, and the dial has better tracking then a TRF, but the sensitivity won't be any better, I'm not sure if the 112 covers the upper end of the B.C band or not. I'm not sure about the 112 chassis but Philco used to like running with triode connected #47s to reduce distortion, which #47s are notorious for.
Regards
Arran