I have not yet started designing a panel layout.

Up to this point, I'm quite convinced to use the Garmin G3X touch system for my main instruments.

Going for a dual screen setup with dual garmin autopilot installed. (Configured with 2 GSA 28 integrated servos for pitch and roll autopilot)

With 2 displays, you can configure your panel to provide more information in the least amount of space. Seamlessly integrate two 10.6-inch displays. Configure 1 display as a split PFD and MFD, and the other as a dedicated display for a variety of features, including traffic, geo-referenced charts or engine information. A cobnfiguration like this also offers full backup capability in case one display fails.

Each G3X Touch system comes with :

The G3X Touch comes equipped to take advantage of Connext, which is anetwork link and in-cockpit wireless connectivity system which can connect a mobile device to your flight system.

It shows engine parameters, moving map, PFD, ND and drives the autopilot servo's.

Some video sampling the G3X at Sun'n Fun  here.

Another full scope G3X flight solutions video presentation by Garmin  here

 

So far, I already purchased the following components related to the instrument panel :

- VERTICAL POWER VP-X-P PRO with connector kit

- throttle quadrant

- magnetic compass

- starter contacts

- TRIG TT22 XPDR W/ 4FT WIRE HARNESS

- COMANT CI-105 DME XPDR ANTENNA 

- Altimeter from Vans

- HSI from Vans

 - RAC STICK GRIP G407 and RAC G401 

- toggle switches with colored covers

- COMANT CI-122 VHF COMM ANTENNA BNC