Chris, I, like Paul, believe you will find the 430 under the GRT to be a nice arrangement. I had my 430 under my Dynon on my original panel so I do have some data points to reference. I find my current configuration,
just like yours to be very ergonomic. You will not have to reach from left to right, right left as you will be pushing buttons on both units. Nice, nice arrangement....good choice
If you have any questions about eating the GRT/430 elephant , feel free to give me a shout. What Paul said..........one bite at a time.....