I too would like to see your install,,,,
I use a small 6in base tube. The specs are 250w of power with dimensions of 6.5 wide by 14 inches long. It is strapped to the rear shelf/wall of my spider and does not take up much room what so ever with still 3 inches or so to the edge of the shelf . It is held in place via custom made leather straps matching my interior colour. It can be simply unbuckled and removed and the seats moved right back does not come any were close to the tube. Looks very inconspicuous and because its a proper bass tube the sound is tight.