N scale Bachman AT&SF 85' Full Dome

The only full dome coach’s I can find are from Bachman, and while they look ok enough, there are a couple of things that really turn me off. I’ll start with a couple of pics.

First off, the letter board is way too big. Any advice on shrinking it and still maintaining the corrugated siding?

Secondly, the couplers. Are the stock couplers talgos? Or are they body mounts? Any tips on which MT couplers to use?

What color tint did the Santa Fe use on their cars, and how should I go about replicating that?

Thanks.