Have you considered Jim's audio panel kit?

I just found a completely assembled version of Jim's unit for sale on Ebay.

See http://makeashorterlink.com/?D2AE15627 .

It looks like a tempting price, but it still looks like major work.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"