For this mortiser I used a lot of design aspects from Woodgears. The main difference being the X,Y tables. Instead of drawer guides, I used polished steel shafts and sintered bronze bushings. It slides around great.
This was the most complicated jig I have ever made. It took me a little over two weeks to build.
If you=92d like to build your own, you can find plans at Woodgears for sale. If you choose to use the polished steel shafts and bushings as I did, there is a CAD drawing on my website.
Cheers, Brian