If you are putting something like a Garmin 600 in your light twin, it is cheaper to buy all the bits, have the panel mod. made in the US and fly a techo. down here to fit it, than have it done locally. And the turnaround time will be measured in days, not months.
What a load of bollocks, each install job is an individual and depends on the start and finish points. The cost of the equipment here in Oz is still cheaper than flying to the US.