The G1 is a challenge to image, especially if you have the model without an Ethernet port. However, we are able to image Window 8.1 Pro w/ Acronis Snap Deploy 4. The USB bootable agent is both UEFI and BIOS bootable. You do need to change the BIOS settings to boot to Compatible and enable CSM. There is a step by step upgrade doc to W8.1P from W8P from Panasonic that enumerates all the drivers needed. Acronis can do standalone deployment also (which is one by one for out of network or mobile units). While it supports PXE I did not try that. I also tried to inject the Ethernet drivers into the Linux USB boot drive but was not successful there though Acronis claims it should work. The Havis dock we used has an Ethernet port but there is no Linux driver for the Acronis boot drive so it is not recognized. Well we are doing this for a feasibility trial before production deployment.
For what it is worth.