Not the same model, but thought maybe it would help in your search (if your interested in trying to track the drains down)…
Prepping to do a couple mods, and I found my drains in a floor cut-out behind a ‘bulkhead’ in the cabinet circled in blue:
Don’t know that I’ll need them, but at least I know where they are.
I am also planning the same false bottom approach as
flagstaff.
I’m missing/wishing-for 12VDC outlets too.
It’s on my to do list… still planning
which ones, location and circuit.