I already got the E8 because of its compact size. I don't think spacers will work on the seats because they fold both ways. I could use the whole seat for the enclosure but it would make things complicated.
I was in the Sundown Section and the manufacturer recommended 0.25-0.3 cubes for a sealed and 0.5-0.6 for a ported.
I do want to fire the sub downward and would like to get a aeroport if I can get a crafty enough design. My main concern is SQ and I really don't want to drop hundreds of $$ on an enclosure. The other problem is finding somebody around where I live with the knowhow to do this right. I was hoping to get some box builders on here to help me out but can't find anybody right now.
Thanks for the info so far!