Just through I'd share some progress on the Walthers power plant I'm working on. I know this isn't an "accurate" power plant interior -- in N scale, I'm more concerned about shapes, not necessarily accuracy -- especially since the windows will have a dirty, hazy look to them and will blur most of what's going on inside. The interior will be lit though so it's nice to not be completely empty. Still some things I want to add in there for when people peek into the open garage door. This will be some distance off the isle, so not trying to go crazy here. Also, for those of you in N scale who have issues with mortar between bricks...I know I always run into the problem of the grooves being too shallow.... For this I tried something new and it worked great. I got some white chalk sticks. I have to look to see what this is actually made of because it's not traditional chalk. I found it next to the charcoal at the store... Anyway...I ground this down to a powder and added a bit of it to a container of water. It tints the water a translucent, milky white. I then just brushed it on with a large brush with the building laying on its side. The nice part about this is that you can keep going over it with water to lighten the effect or brush over it again to get it darker. This has been the most forgiving method of mortar lines I've found. Matter of fact, I went back several times over the course of 3 days, lightning and darkening without issue. Then, just a coat of Dull Cote and you're good to go. Also, I found that if the white is too harsh, a light dusting of black or brown knocks it back nicely.