actually bending wood I think is a bit intimidating for most. There is an easier way to get what you want, IMO
. I suggest reading all the options given here and decide which you are most comfortable with. Just about any option for bending wood requires a LOT of clamps lol...
First you need to make a little "tool". Find a small square piece of wood that is about 1-2 inches wide (this is how far outisde the edge of your tank your hood will sit) Securly fasten a pencile one side of the block so that the tip of the pencil is flush against a table when the block is set down.
Take a piece of cardboard that is bigger than the top of your tank. Lay it on the tank and have someone hold it down firmly so it doesn't move. Take another pencil and draw a line around the outside of the front of your tank (include a few inches of the sides). Now take your tool you made and repeat the process again, this time, placing the side of the block withOUT the pencil, against the edge of the tank. This should draw a line exactly parralell to the first one an ich or so apart.
Lift the cardboard off and you now have a template for creating your hood to the right shape.
Cut out the template as close to the outter line as you can. you may want to leave the inner edge of your template square so the hood actually sits on top of the tank. Thats up to you and how you plan on resting the hood on the tank.
Use the template to mark two pieces of solid
wood (not plywood) and cut with a jig saw to that exact shape. Use those pieces build the frame.
When the frame is complete, use 1/8" inch plywood and glue it, nail it with finishing nails and clamp it FIRMLY on one end then again a few inches over and let the glue set for at least an hour. Come back, LEAVING the existing clamps in place, add a few more inches of glue (good carpenters wood glue), nail and clamp those inches. wait and repeat until the entire front has been glued, clamped, nailed and dried. If you wish, you may repeat the process again with another piece of 1/8" plywood. Use glue between the two sheets of ply and you will have a VERY sturdy 1/4" thick front panel. then use normal 1/4" ply for the rest of the hood.
or you could find a friendly wood shop at a school and see if they'll be willing to help you out. COuld be a good, "Project" for an aspiring artisan.