I have done the heater (installed the matrix below the floor and hooked up one of the telescopic cables and also a limit switch on one of the heater levers).
http://forums.aussieveedubbers.com/viewtopic.php?tid=46532&page=3
This keeps everything looking stock but there is nowhere near enough room under the floor for the AC unit like I had intended. Will be mounting the AC blower to the left of the handbrake and the AC head unit to the right of the handbrake with flex pipes up and over the handbrake handle to connect them both.
I left all the AC cabling in the cut down subaru loom so apart from the forward controls it should be pretty straight forward.
It's all a work in progress and still some time to go yet.
I'd be interested in anyone else's experiences.
Brendan