When the in-laws were here (Cheyenne, WY) visiting, my F.I.L. was REALLY impressed with the UP Big Boy #4004 that's in the park so I want to build him a static model of one for Christmas. I picked up one of the Revell plastic kits of that loco and now I'm in the market for some detail parts since the plastic kit is OK, but you can tell it only cost 20 bucks. I've already seen a few places where I can improve it (decals to model #4004 vs. the 4006 ones that came in the kit, replacing the molded on grab rails along the boiler with wire and stanchions, etc...) but if there was a source out there for nicer wheels and other add-ons, I'd be interested. I'm not looking to make this a show-quality model, but I'd like it to strike a balance between detail and cost. FWIW, I've been modeling off/on for ~15 years, but haven't done much lately so I'm out of the loop for quality parts makers/sources.