Riveted tank support in place. Marked and drilled for sump drain. Installed tank portion of sump drain fittings. Enlarged sump drain hole to 1-3/4” using carbide bit in rotary tool and half round file. This allows the large nut on the sump drain fitting to fit through the floor.
Instructions are cryptic/missing, in some cases refer to non-existing parts. Probably a residue from Rotax instructions.