I'll tell ya Lou, I been watching, hoping you'd show another tool like those vintage Porter Cable saws and Belt Sander. I looked online for this Craftsman Planer Base of yours; Model 315.250530. Found this on eBay. I reckon the Motor; Model 315.2505, having its own model number might imply it doesn't necessarily come with the tool. You saying that an alternative to the motor is using another power source? I've seen these vintage tools, like Porter Cable using a drill to power a circular saw.
Also, I'm wondering when this was made. The additional stamped serial number that follows this model number; 5317, makes me think it might be 1953? But then I see side of the nameplate "1934-01-R1".
Sure is a real nice find. Pristine condition.
Hal