A Halide should be situated approximately 8" above the water line, this would mean you end up with a very high tank hood and it would certainly have to be custom made. There is no way you could retro-fit a Halide into a standard tank hood as there just isn't room.
I have custom made a 'hood' for my 100g which is nothing more than a wooden frame with a top, hinged lid and front so that when looking at the tank it looks like it has a full hood. You could go with something like that but bear in mind it is approximately 24" high in total.
As I said before though, a Halide mounted in a hood, even with a cooler, will not keep the water temp stable, just by removing the back will not be enough to rectifiy this.