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Here's a quick 3D render. The purple part is what you wrap sandpaper around.
The green and red are held together. Nailed, glued, get fancy with dowels or dovetail joinery, stick them together in some sturdy fashion.
T-nuts need to pull inwards so you want to put it on one of the faces away from the boards.
You could also just put a couple of holes in for wood screws. Depends on how long lived you want the tool. Use a T-nut and bolt and build it with care, could hand it down to your grandkids. ;-)
Of course to make a straight/smooth rabbet, the areas the boards ride on have to be smooth.
Another way to do a rain gutter for the hatch would be to first sand the rabbet with this tool then glue a strip of foam on the edge before glassing.
Make a mock up by gluing up a stack of your scrap foam to use for practice. Get some lengths of hood and hatch edge perfected and glassed so you'll have your technique debugged before doing it to your laboriously constructed and $$$ invested vehicle shell.
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