Thank you for the suggestion with the power supply.
This morning I have tried a number of different power supply units (including the official rPi3 plug and cable) and this allowed me to get the device setup and SD card expanded as per the guides.
Issue now is the wifi looses connection to my home internet? The AP is still up but the 'second connection' to the router fails?
If it helps, I use apple airport router and a number of AP. The wifi failed on both router/ap AND also failed when tethering to my mobile phone wifi hotspot?
Now if I boot the device up with the ethernet expansion board connected (I use the expansion dock with my Omega2+) I can get network address/connectivity from my router/network. But again, remove the ethernet module and I am back to only having the ability to SSH/WebConsole via the Omega AP.
Could this be power related?, The Omega is using the latest firmware available from the Onion repos and flashed using the onion guides.
@Douglas-Kryder all great information, thank you. Your guess of a new wifi driver release seems realistic. If it doesn't arrive by July (which would be nearly 1 year late) then it probably won't ever come. I'll start testing the official lede builds with Onion packages and report back my findings.
BTW, since there is no OSC_out pin brought out to be exposed in the PCB (most won't, it is not a good idea w/o termination anyway), you might just as well put your own oscillator on the SGTL5000 codec board.
The LD1117S33 (if authentic) needs minimum of input 0.1uF and output 10uF capacitors.
Also, do not use thin power supply wires. I recommend minimum of 22 Ga.
Okay, I added 47uF and 220uF capacitors to my circuit (on Vin and Vout of the LD1117 respectively) and swapped all the wires for 22 gauge. And... it works! Boots up completely and was able to setup wifi through web config and so on. Thank you!