Looks very cool
FYI, those ballscrews on the arm are probably going to be too fast a CNC mill application (they look to be about 1tpi), so plan on upgrading or scrounging for some more desirable 5tpi screws.
Where are you located? I'd love to find a surplus place like that around me. What kind of prices are they getting for stuff like that if you don't mind me asking?