I have built the Smart Models free signal box and I thought the textures weren't too bad.
As already stated you could re-cover with scalescenes if you want the finishes to match, to be honest I think a variation is better, not all buildings in an area are built with the same bricks or materials.
I like the scalescenes stuff and have a few of the kits, the one thing I miss is a variation in the roofing texture, you can tell the scalescenes Grey Roof Tiles a mile off, I have now started creating my own roof textures for variety.