I'm thinking raising the false floor slightly (another inch or so) and putting some colored light inside might help to display the amp a little better. Overall it looks pretty decent! I actually was thinking you had done something a little different, but I'm not going to give away my idea just yet because I might want to use it.

If you do go with moving the amp under the seat, be sure to test fit the amp first before you commit. It looks like there is a lot of room there, but it's pretty tight with the seat slider mechanism. If you run into height issues I've got a trick that you can use to give you another 1-1/2" of clearance under the seats (but your seats will sit up higher, of course... not an issue for me at 5'9", but may not be an option for taller guys).