I thought I would post up a friend of mine's Camaro that we did an install in. I'm planning on either doing the same thing behind one of the seats of my elkie or mounting the driver inverted so it sticks out between the seats. Not sure yet, but if I do glass the floor behind the seats I'll make mine look similar to this:

http://community.webshots.com/album/76505651sfVzsC

For those who might be wondering that's my woofer in roughly 1 cubic foot sealed. :-D

thats a pretty hefty sub, what kind is it?

It's a subwoofer that I designed called that Magnum D2. It was designed with the goals of an extremely small enclosure volume while still being able to reproduct exceptionally clean, accurate bass. Just click on my web page link at the bottom. If not, I'll post more when I'm finished. :D

The subwoofer was designed with the design goals of Extreme Hi-Fidelity, exceptionally tight bass, and exceptional low-frequency output from a small sealed or vented enclosure. I'm pretty sure we've met that so far. :)