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I think that I remember Bruce posting the dimensions of his x-braces and he stated that they were 3/4" tall at the intersection and this was based on an Hd-28 plan. I have the plans for the Martin HD-28 and mine seem to show that the x-brace is exactly 5/8" tall at the x-brace intersection. I'm not saying that Bruce is wrong, but I want to make sure of the dimensions before I cut them. I don't want to underbrace the top, but I don't want to overbrace either.

FYI I am using 3/4 on my D-series. I got the dimension from measuring a D-28 kit I got from Martin several years ago. My plans I got from Martin said 5/8 but the braces sent were 3/4. I looked at it this way the extra section gave me more brace to scallop during tuning.

Hmmm Jeremiah, I don't remember posting 3/4. I do remember 11/16" tall because that is what my xBrace notching tool is set up for and I use the same brace on all my guitars. But you get close to that and it'll work. Height not width, is the real stiffening agent when it comes to bracing.

Yeah, if you look in the archives from the old forum you'll find it in the January 2005 archives under the topic "Question for you Bruce concerning your x-brace scallop jig." I had actually printed it out at the time because you gave a lot of useful information like where the intersection is centered at on the x-brace, where valley of the scallops are located, etc.