resqdoc,
I have made 2 (can't remember the sizes off the top of my head), one for my 2K RG and one for my 2011 SG. I did the same for both, started with a socket I had laying around from a 4wd front end (similar to the link you posted). Then I purchased a socket from Sears, I cut the ends off both and welded them together to make a deep socket. Mine were both 1/2" drive, which is good so it went right on my 1/2" impact. On the 2011 I cut a piece of 1" thick wood with a hole saw, the first cut was the ID of the socket, so it would forcefully go into the socket. The second cut was the OD of the shaft. I put the chunk of wood in the back socket before I welded the two of them together, this made a support for the shaft so the socket didn't get off center. Hope that all makes sense, I am better at wrenching than typing

At some point you have to look at the cost of a store bought tool $120ish, vs. all the work and buying the sockets.