Not instructions but might give you an idea.
http://www.ebay.com/itm/vtg-ho-scale-plastic-model-building-ahm-5811-old-time-factory-toy-train-houses-/321102366677
I did a Google search for ahm model 5811 old time factory and came up with the link and some photos of the box it came in also. Give it a try. You might find more info.
Edit.
Sorry, forgot to make it a Hyperlink.
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
Hi,
This model has been around "forever" and in different versions and I believe even under different manufacturers.
While instructions are nice, they really aren't necessary with this kit, especially if you have a couple of pics. Take your time, and work it through w/o glue first.
ENJOY !
Mobilman44
Living in southeast Texas, formerly modeling the "postwar" Santa Fe and Illinois Central