The false floor is great...if you have AAA Insurance. What happens when you get a flat and have no spare tire??
Looks good though.
As for a rear seat delete, well, unfortunatly that would have to include a rear brace bar since the seats when up and locked provide also lateraly structural support. Xtreme 2, I got the concept already designed for it, ttyl about it.
The false floor works on the idea that you still have access to your spare tire by creating a new floor in your trunk. In theory you raise the actually floor by a few inches in order to place the amplifier there, thus keeping access to your spare, but in the event that you use the false floor to store your sub and your amp, the subs required cuft will determine if you still have room for a spare.