First remove the four top screws holding the top panel and the four screws at the back holding the back panel. Pop the interface out of the housing.

Do not unscrew the bottom plate. There is nothing behind that. Just a massive plastic case that smells quite unpleasant when opened. Save you some time and leave the metal bottom panel where it is.

The board is held by massive stand-offs which help to avoid flexing. There are no screws here.

The housing is made of very solid and massive ABS. Nothing else can be seen or serviced from the bottom of the unit.

The bottom plate is made of ca. 1mm thick, painted steel sheet.

The unit is very easy to open and to repair. Nice!

Self-tapping screws are used to assemble this unit. Do not overtighten during reassembly. Not made for frequent reassembly.

The unit weighs 880g. This is a lot for a sound card in a mostly plastic case. This weight and robustness are achieved by using a metal plate and an unusually thick ABS plastic case.