The only caution I would advise is that the fan loves to jam on mine post installation of the WD. The Steam Deck will run but throttle viciously. The problem disappears with reinsertion of the stock eMMC or a little 256GB module.
The only solution I found was to simply not screw in the rear outer enclosure screws fully tight, or to replace the cover with the JSAUX unit that includes an additional heat spreader.
The only solution I found was to simply not screw in the rear outer enclosure screws fully tight, or to replace the cover with the JSAUX unit that includes an additional heat spreader.