I made this one several years ago and it has worked very well for me and is less complicated, very adjustable and easy to set up and use. Cost me about $15 to make buying the plans and hardware. I had one similar to the one in your video and it required me figure out the number of turns I needed get the size I wanted for a box joint and keep track of the number of turns each time I went to the next cut. I never did quit figure it out so I discarded it and went to the one I have now. Here is a video on how it works, the plans are still available from Shop Notes.
https://www.youtube.com/watch?v=lmrGa_LDxoE
http://www.shopnotes.com/plans/box-joint-jig/
If I remember correctly the plans tell where to buy the hardware or you can use whatever you dream up. I just found it easier to order the hardware.
I almost bought the Incra Box Joint Jig when it came out, but decided the one I have does a great job, why spend the money on the Incra one.