Take a look at the center section in my panel. The audio panel would be the same height as the radio in mine.
There are some gotchas here. Because of the depth of the radio and 6xx, the bottom of my radio is as low as it can go without opening up the hole in the subpanel. It can be done but will require some modifications on your part.
With these devices you will have a hard time getting any switches below them.
I did have space on either side of the G5 for some switches. This layout has worked very well for 130 hours now.
You might consider the remote mount GMA 245R audio panel. it would give you plenty of flexibility here.