Kevan,
Have you done an Internet search? I just did and it threw up a number of hits, including the page for the WT2527 designer/builder at the engine plan page. Ok, it's in German, but for some reason there is an English version when I looked at it on my iPad. Also as a result of the search, there is a build thread on this very site – WT2527 build log. So far it has run to 4 pages and I have to admit that I haven't read it as it doesn't particularly interest me , but I gather from Jason's first reply, he's made one, too. You could do worse than have a look on Home Model Engine Machinist. There's almost certainly some reference there – probably Jason!
Good luck with your build; it looks a powerful and chunky motor.
John