Not much of an update, but started testing out electronic components. First up is the on/off. It is a simple SPDT switch connected to the adafruit 1000c. I did the same connections as Wermy on his custom GBZ build. Circuit tested out good, so i will update next time with any news.
Waiting on the Screen, ordered the GearBest screen, since it is proven to work.
Tested the V3 controller, the Pi turned ON, but got no response from button pushes. Tried connecting a keyboard to the OTG and also no response. I desoldered the components just in case the Pi was fried.
But the pi works with a keyboard connected without the V3 controller.
Will contact TinkerBoy for any suggestions.