Well, I got time to finish everything but decals I haven't ordered yet. Overall pretty cool.
From left to right, mth, lego, weaver, I hope the picture is big enough to see.
So this lego model is a little higher than the mth and weaver. The overall body proportions are pretty good. The length is about the same as the mth, the weaver is longer. The Lego model breaks down when you compare the ladders which are neccessary clunky for lego.
The width of the body is pretty good, but again the ladders really stick out. There are other ladder options, but these are probably the best looking compromise.
It did make a couple loops on a mixed train with 0 72 curves. I will take a video after I get some decals applied. Overall I really like it, and consider this to be a successful full lego build. There's always room for improvement, so I am sure I will build a few more later this year.
Let me know if anyone else tries something like this.