I can show source code to trusted dev, this is not a problem if only he will promise me in public that he will not release the same wallet after observing source code.
One again, my intentions are clear i want to provide good GUI wallet and receive developer donations, because i can see 14000 XMR funding for GUI wallet that is another RPC thing.
https://forum.getmonero.org/9/work-in-progress/2476/the-official-qt-gui-project