Thanks for making me feel so old Jack!
That's exactly how the mill just across the dam from where I grew up looked and worked. As kids, we'd peek in the cracks and gaps to see 20,000 sq. ft. filled with belts and a lot of wood mounted and based machinery working away.
Funny thing was, the economy and opportunity were growing back then - what the hell happened?
Neat! I have never seen this othen than in drawings!