Eric,
Dr Tom pointed out to me off list that that is a fine scale miniatures (FSM) sawmill kit, and not a SS limited kit. (Tom is too polite to point out my error in public.) SS limited kits are still available, but the FSM kits were all limited editions, and un built kits go for many $$. some ss limited kits have lots of details, but not as many as the FSM kits.
I have a FSM 2 stall engine house on my DG, CC, & W RR. I worked for a Model Railroader doing construction work after my senior year in high school. After pulling huge amounts of overtime, I showed him a plan I had for a switching layout. He said " You need to get that FSM engine house @ lenox toy and hobby to go right there, It will fit there, and look good, and after that paycheck you can afford it. the box for one of those kits weighs about two and a half pounds.
So search for plans for a FSM sawmill.
Bill Nelson