NB50

Build as much as you can outside of the trunk then assemble in the trunk.

Might want to mention if they are shielded or not.

Nobody's Lonesome For Me - Hank Williams

Lateralus - Tool

Nice, I heard Pro60's on a sound board and enjoyed them.

http://www.soundsolutionsaudio.com/forum/forum/68-fi-technical/

What part are you talking about it? That a speaker needs to break in so it will last a long time, then no its a myth. Or That a speakers suspension will loosen up with play time, then yes.

Pet - A Perfect Circle

Planet Caravan - Black Sabbath

Thats more like Gordon Lightfoot - Sundown, he was big with sailors right. http://www.youtube.com/watch?v=eLcx4VCkJH0

Good Job.

Not hard to find one. http://www.kenwoodusa.com/UserFiles/File/Global/Consumer/Manuals/KDCX589.pdf

Sounds about right, looks like a good amount of port area, you'll have ~14in^2/ft^3.

I wouldn't use the same box unless you changed the ports. Just some quick calculations its tuned close to 40hz.

Bad Company - Bad Company

Bad Company - Five Finger Death Punch

A Warm Place - NIN.

I'm So Lonesome I Could Cry - Volbeat (Hank Williams cover)

If I only had a Brain - MC 900 Ft. Jesus.

Santa Monica - Theory of a Deadman

Still Counting - Volbeat

Pet - A Perfect Circle

For a BL i would use a double baffle. Not doing the 45's will change the enclosure entirely, from box volume to port length, which both will have an effect on tuning.

Thats gross volume, you will need to give up more space if you want to go ported to account for port displacement.

Double Bass - Gorillaz