Just use decals for the door details. Don't forget, those are almost N-scale sized photos of a T-scale loco. Seeing them in person (especially after decoration is complete) probably would not make it nearly as noticeable. But "rough in" the door lines using decals, and I bet that even the n-scale photos would look good.
When will these be available for purchase from Shapeways? I see the original is no longer on Shapeways. Will you be creating more variety of modern rollingstock? FYI - I would be interested in wellcars (with 53' containers) and spine cars with trailers (and maybe a 53' container variant). I can do my own metal etchings of handrails, ladders, platform walkways, etc. let me know! I want some when they are ready! Tim