If it is a straight bend without cutting, you can fab up a jig on a workbench with clamps, 2×4’s or angle iron and possibly some plywood. It obviously wont be as pretty or neat as a shop on a bender, but it would work. I have bent 12ga steel in my shop with this method.
Tough to describe how it works, but i’ll try.
Lay the sheet on the bench and overhang where you want the bend. Put a 2×4 or angle iron on the edge of the table and clamp it down TIGHT. From there, take your thick sheet of plywood and lay it over the aluminum and butt it up to the 2×4 with a slight gap between. Clamp the plywood down in multiple spots on the sheet. Slowly begin bending, keeping an eye on the bend. Some types of aluminum, specially when thin, can rip at the bend…