I'm in the process of assembling and painting both of the bridges. The deck girder bridge went together without any trouble. The instructions confusingly try to cover the steps for HO and N scale, 40' and 80' bridges, so I had to figure out for myself that the included deck plate was 80' and had to be spanned in half for my 40' model. Right now it's painted a flat black but will receive some grey and rust details. The Stoney Brook Bridge is fantastic. I do regret the time I spent putting the scale rivets into the sides of the supports (I only did so on the outside too) but so far it is looking great. The picture above is only missing the walkways and side barriers.
I finally hooked up my wire foam cutter to the 4.5 battery it requires, only to find that it doesn't heat up for some reason. I had hoped to build the upper level yesterday, but since I can't cut the foam effectively it looks like I will have to build a strong but light base from cardboard sections to support it.