Good pull! It is always nice to hear of machines being saved from the scrapyard. What a waste. Mine was a story similar to that but I got it before it ever left the shop. The old owner couldn't really sell it and he offered it to me for the cost of moving some machines around when the rigger came to remove mine. Everyone was happy. He got to see the machine go to a home that appreciated it. I got a machine that was working and in pretty good condition (with some tooling), for a very reasonable price (effectively free). His father was the original owner and I even got an indexer with it. It was dirty, but I'm happy.
The biggest problem with the Dyna mills is that they use a retention knob that is unique to the brand (for the smaller 30 taper guys... don't know about the larger ones). There are people that will make the studs for you, but they want minimums and that makes them unreasonably expensive for we hobbyists. Drawings exist if you want to make your own, although it would be nicer to buy them. The supply of the studs is sketchy.
Anyhow, I would think again about the idea of using the machine as a manual mill. Truthfully, I've never felt that CNC machines work well as manual machines or vice versa. The ballscrews work best for computer control because they are fairly coarse. That type of thing...
Alan