The Engel Gato looks great. The Engel WAS going to be my next sub but now I am not so sure.
Before you do all of the wiring and servo cables I would advise opening the slots in the bulkheads for the wiring that goes forward. Also, you will need a lot of servo extension leads. Try to get them in 26 gauge. It will handle the current quite well and makes it easier to run the wires. I had a bunch of extensions in the larger wire size and could not run them all through the openings provided. I manufactured my own extension to get the length very close. There is not enough room for extensions that are too long.
Just a heads up,