Well that's more or less a copy of the Oneway jig system. http://www.oneway.ca/
Many people have made them out of wood and metal. My first one was wood but I used dado slots in the bottom platform. My second one was made out of square tubing like the Oneway but I still used dado's in the wooden platform.
I also built my own modifications of the Wolverine jig that Oneway sells to sharpen bowl gouges. Mine eventually evolved into a sort of David Ellsworth jig.
I now have the Oneway system. It simply works better. The Wolverine jig is adjustable so on the rare occasion that I need to adjust the bottom bar angle I can. I drilled a hole through the backing plate and adjustable arm at the most common angle so I can easily exactly repeat that angle.
I don't like that skew sharpening attachment. I made one that sits on the platform and slides back and forth. It has a V block glued to it that has the angles for the skew. I find it easier to use.
I have also made jigs that go from the V arm to the wheel so that this distance is always correct for different tools. This also compensates for wheel wear. They just sit in the V arm and touch the wheel at 2 points. This is accurate and very quick.
I use the Wolverine jig to sharpen both my bowl gouges, spindle gouge, and detail gouges. I made different size blocks to sit in the V arm to change the angle of the grind for the spindle and detail gouge. I set the arm to the bowl gouge setting and then put one of these blocks in for the detail gouges. This way once the arm is set and locked it doesn't change position for most of my sharpening needs.
If you want a really good system check out the one made by Don Geiger. www.geigersolutions.com
It's also important to have wheels that run true. Don sells the best wheel truing jig on the market.