I'm not worried about T- molding, Just don't have a router, so never thought of this step.
Good news I've found my Buttons & 2 joysticks (under everything else of course), But then had to look at the build on the front section as I want to install a button each side for pinball, and the frame is too big where I want the buttons to go. Luckily nothing glued yet, so modification to frame will be easy but will have a hole to fill on the outside.