We're not saying to copy the maniac bumper exactly.... you can, IMO, easily improve upon the design to make the winch compartment accessible. A stainless steel hinge, a plate, a weather seal and a latch.... on top would probably be best.
Due to winch size you may still need to install it before installing the bumper. But the hatch will still allow access to the winch for service, or even for use if it doesn't have a remote wire.