They're 3/4" just like your H80.
I use 1/8" H80 for the top and bottom and 1/2" eps foam.
You don't have to use glass, that'd just add strength and a little bit of weight, if you'd like you can just use the epoxy with no glass then throw it through the vacuum bag. But I'd highly recommend using glass between the top layer of Divinycell and the EPS foam.
I don't have a great scale but holding a 126cm of my board next to a 123cm misfit you could tell the difference.
Once I get my camera back I'll take some pics for you through the whole process and make a new topic.
This is how I make the boards from my site... which I haven't started selling yet since I need to get a new FTP client and I need a DBA and business/tax id's etc.
EDIT: Forgot to add, the biggest advantage is strength and the weight difference. The only disadvantage is it's a longer process and you need more equipment to do this compared to other ways...
I'll tell you what... once I get my DBA and tax forms I'll loan one of you a board to make a review on... gimme an email at Kevinwhite@kiteboardingcentral.com
If you like the board after riding and reviewing it, you can buy it for cheap... otherwise send it back, etc etc.