I recently started building the engine house at Winchendon Junction. I am using a kit released in 2007 by Stone Creek Designs.

The kit features some very nice cast hydrocal stone walls. 

I used an exacto knife with a #11 blade to cut out the plaster in the windows.

 .I used a thinned gray acrylic paint to put a base coat of color on the walls.

Next work session I will dry brush black, white and brown highlights on random individual stones. Then I will wash the walls with a very thin black wash to blend all the colors and emphasize the joints between the stones. If anyone has any suggestions please post a comment.