I almost bought a double manual organ a couple of weeks ago but then I came to my senses. It looked to be in great shape too. After reading online about buttons and switches and contacts on fixer upper organs, I decided to stay away. I always wanted a double manual organ, so I thought anyway.. At least your instrument is all mechanical.
Restoring an organ can be very rewarding, especially if you are going to MIDIfy it. Too many of them are going to the dump because few know what to do with them. They can be had for very little. If you go with a brand that had a reputation for quality, you could end up with a very good instrument when fixed up. Today's virtual organ software is quite amazing.