If it’s like the larger AS as I would suspect here’s the biggest tip I found. Looking under the counter I assumed that I would unscrew from the various brackets around the front and open sides. Then unscrew from the metal flange connecting the aluminum side of the inside shell to the counter. I found it MUCH easier to unscrew the metal flange from the side of the shell and remove the countertop with it attached.
Just go slow. Nothing should be glued so if the counter doesn’t want to come off there’s probably another screw attachment point you missed. Good luck!