Rummaging through an old box of pieces/parts, I came across this little gem.

It looked a tad small for HO, being it was in a box of mainly HO parts, and the back windows have been raggedly cut and placed, but with the front opening, it looked big enough to fit an engine in, so I pulled a piece of flex and an SD40 out and it did fit, and looked like another would fit, so pulled another piece of flex and a U25B that was close...
So does anyone possibly recognize this structure from a kit or built up? And on the other hand, with some touch up and paint and weathering, and some work on the raggedly added windows in back, I'm thinking it could make a pretty nice little shortline engine shed??
Any suggestions?
michael