Well I can tell you how I do it, I suspect Mario does it very similar cause I stole the methodology from him
I create two strips for each brace and have a little jig with 1/4" bolts at the end that I slide the strips over (I drill holes in the ends of the jigs). Then I use .020 X X 18 cf strips (from LMI or other places) and using a good quality 45 minute epoxy I wet the first strip, lay down the CF, then wet the CF and lay down the second strip.
I repeat this for all the ones I'm making (putting wax paper between each slat I assemble), then I put on a top piece of wood and use good strong clamps to squeeze the snot out of it and let the whole thing cure overnight.
When done I remove and trim them down, I end with braces that are a little less than 1/4" thick, about 3/4" high and 18" long (my strips are longer and I trim the ends down to the CF length).
My only caution with this is that it plays hell on your carving tools, I am now shaping my braces long before I get them on the guitar becase CF laughs at sharp blades.
Hope that helps...
-Paul-
P.S. i can post pics tonight when I get home from work, but I know Mario has some that he posted on MIMF some time ago so he be able to illuminate how he does it better.