About customized Variants
The GTA04 has not only been developed with replacing the Openmoko GTA01/GTA02 motherboard in mind. It has been designed to be the core module of other devices. Therefore, it can be optionally provided with two 60 pin Board-to-Board connectors.
You can see an example device here:
It provides a 3.5 inch VGA (640x480) touch display from Ortustech and a 3900 mAh battery.
To simplify your design efforts, we provide a sample EAGLE 5.x board and schematics file (based on the device shown above). Just download and start developing your own adapters: