You're getting a lot of opinions, so I'll throw in my 2 cents. First, I think you will love the equipment you are installing. A couple of comments regarding the layout:
1. I would suggest moving the G5 higher. If you try to fly that as a primary instrument in real world conditions, I don't think you will want to be looking down at where it is now. Mine is left where you originally had it and I like it there, but center makes sense too, just higher in your field of view.
2. Give some more thought to the switch layout and think about the flow. The biggest thing I see is the placement of the Master switch being under the Touch display. Your hands will bounce around in turbulence and that's one of the last things you want to inadvertently hit in flight. You may be planning a locking switch, but I would still move it over and up along with the rest of that set.
3. I put my warning lights on a dimmer and they are above the PFD. Full bright at night would be a distraction with mine, but I like them where I may see them first and not my passengers.
4. Lastly, the ELT remote is not something pretty to look at, but you might consider placing it more in view. I have mine where yours is located. One time a passengers accidentally touched the test button and fortunately I heard the beeping from behind the panel and figured out what it was before I took off. Being that far over I couldn't see the light blinking that it had been activated. I got it reset, but not before the signal got to Air Force Rescue! Fortunately with a Bluetooth headset I was able to answer the call and explain everything was fine before they called my wife!
These are just my thoughts. Have fun with it! It's great to design it exactly as you want!