A few quick questions about TFHQ plans and joint placement/planning in a timber.

[ShaneW]

So ... a week or so ago I was searching about a timber framing topic on Google, it brought me here, and I found some really helpful information on an unrelated topic that I didn't know I was curious about. I came back after finding more time to study it out, and low and behold, I cannot find it. The topic was about joint planning (not removing too much wood to decrease strength etc) that went way beyond the general rule of thumbs (tenon size is 1/4 of timber size, peg size is half of tenon size etc) of course it was Jim Rogers who was writing it, and if anyone can post a link to a similar thread that would be great. Also, trying to figure out how the issue of centered joints in TFHQ plans affects timbers that are imperfect. 

[Jim_Rogers]

If you have imperfect timbers you can still use square rule joinery with centered tenons and mortises. It's just a little harder to layout and cut then standard 2" off set joints.
You'd have to draw a straight center line down the imperfect timber and layout off of that.

Jim Rogers