On the picture you posted after the primer/mortar, how did you get the 'concrete' lines so perfect. Did you mask them. You must have a much steadier hand than I do.
The door issue is interesting. Unless a figure is next to it, I doubt anyone would notice. Looking back at the pic you posted of the FDNY firehouse it seems to have a too small door as well. Maybe it's the door for the dalmatians.
Jeff

Jeff