i can see that working for the front seats because they just bolt straight down. With the rear seat, I'd have to raise the actual locking brackets on the rear and mounting/pivoting brackets on the front. The hardware from the under seat drawer does all this, and bolts to the original holes iirc. The part I'm not sure of is when the seat gets locked into place, if those brackets hold the seat up, or if the seat will bow down because there is no support of the drawer.
All because i dont want to spend $400 for the whole tuffy set up but would like the storage space underneath..