Hi Bob,
There's only one 'mistake' on the drawings. It's the position of the governor linkage pedestal, unless they've changed it. You'll have to calculate out where it should be. The other issue, but not a mistake, is how they go about dimensioning the linkage points for the parallel motion. They want you to make the links, assemble them then swing the connecting link against the pivot block on top of the column crown plate and scribe a line so you can drill the hole. It's kind of crude dimensioning when a little trig is all that's needed to machine it correctly in the first place. I'll see if I still have the work sheet with the drawings from when I first built it. If I do I'll give you the numbers.
gbritnell