Why cut up the original kick panel?
Do what I've done twice and make a new front kick panel for what ever custom sub you want and save the original panel.
I've got a custom kick panel with a JL 10W7 in there with a custom box and a JL 1000-1 amp running the sub. I've also relocated the rear heater to the passenger side under the bench seat. I can post a pic if anyone likes
Brady in MA.

----- Original Message ----
From: miguel pacheco <mundopacheco@GMAIL.COM>
To: vanagon@GERRY.VANAGON.COM
Sent: Fri, April 9, 2010 9:31:08 PM
Subject: SubWoofer Installation & Cuttin'up Your Westy

I have my new 10" Woofer ready to install. Originally, I was intending
this install it into the kick panel beneath the rear bench, on the
driver's side, but when I mentioned this to my son (brought up on the
teats of many vans,) he was horrified that I would 'butcher' the
Westy. He's right in some ways, but there exists a camp out there,
that is all about doing whatever gets you groovin' and free love, and
all that jazz....baby yeah, cut it if it makes you feel better. Well
it's times like these, when I am grieved by such a dilemna, that I go
to the valued list members for their wise comments. I am the butcher,
ready to draw blood.....and plenty of it! Cut! Don't cut! I am torn
and I don't want to pay for counseling, which, for the record, I have
never paid for, or gotten free........except on this list!
GIA (gracias in advance)
Miguel

I have not failed. I've just found 10,000 ways that won't work.
  - Thomas A. Edison