Hey Sean,
Just a heads up- I wasn't careful on my first strip build and ended up with less than 3/4" rise in some places on my first cockpit. I found that the brand (can't remember name) of spray deck, I designed the cockpit for, had a large rubber rand (part that grips the cockpit) that would not fit under the cockpit rim in these areas with smaller rise heights. Made for a lousy- read wet- fit that allowed water in while paddling. Vowed always to use a solid spacer throughout the circumference of all my cockpit builds. So if you want to build smaller than a 3/4" riser height I suggest you have a model of spray deck with smaller rand to fit this shortened height.
Michael

: I am just getting ready to rebuild my cockpit coaming. I'll be
: going with a built-up glass affair using foam as the form. I
: want my coaming as low as possible to help with layback rolls.
: I'm thinking that 3/4" is enough under the lip (deck to
: underside of lip height" Anybody go any less than
: 3/4"? See any problems with this?

: Sean