The lamination is even simpler because you already have a great mold. Use 3 layers of 1/4" ply cut across the grain- NOT with the grain. If this is too stiff most lumber yards carry a bendable luan, the grain all runs the same direction and it will form the contour easily. Use the bottom of the tank to so the lamination sits right on the trim, if the lamination sets up twisted it will not sit flat on the tank. Run a 1x8 across the two flat sides, this will protect the glass because you are going to use ratchet straps to clamp the layers while the glue dries. Use titebond 2 wood glue, (it has better moisture resistance than titebond 1) use a roller to get a FULL coverage but thin consistent layer of glue between you laminations. Let sit 12 hours and even after you take it off the tank keep a strap around it to keep it from springing back too much. It will always spring out a little but you will be able to form it back when you assemble the rest of the hood. My suggestion would be to make the lamination an inch or so taller than needed, then once the glue is completely cured run it through the table saw to clean up the edge. It might be a little awkward but just slowly roll it through keeping it snug to the fence. Take off half the extra then flip and cut your final width. Mine will have a front hinged section for feeding and a light tray that will lift straight up, or something like a hinge and a piston like was already mentioned.
This should give you a very nice clean looking hood, trim it out how you see fit. Like I said, I don't think I will get to for a week or two but it sounds like it would be a good write up with photos for all those with bow fronts.