Wood base for 4507 cabinet

[jbl]

I have my 4507 cabinets resting (not glued) on 1/2 inch plywood painted black and siightly recessed. Looks nice.
Can anyone measure the deminsions of the base used for the L200, L300, 4331,4333 or any of the other pro line, 5 ft3 cabinets.
I think it would be best to glue the base to the bottom of the cabinet rather than have the cabinet sit on the base. Moving the cab would be much easier.
Please include the recess from the front and sides of the cabinet.
Pics would be great.

[macaroonie]

L300 side view. Yuo should be able to extrapolate from this. Dimensions are

H 32 5/8
W 23
D 22 1/2

I'm guessing 2" high recessed 1 - 2 inch from perimeter