Hi:
The locker hatch is threaded.
Sorry, I don't have any pictures of the setup, and we will only be on that boat briefly in a few weeks to remove our stuff to our new boat. I'm taking the bracket with me because I'm going to use it at home (minus the backing plate). LOL: It's a shame I only got one season of use from it since it was such a work of pure genius and craftsmanship
It was actually pretty straight forward to build, and then I just measured the distance between the mirror clips and screwed them to the back of the backing plate. Main thing to watch is the weight and support for the TV.
If your cabin is like mine the interior Vinyl is beige. I picked up a yard and padding from a fabric store for about 10 bucks which would probably cost you $30 from West Marine. I cut and wrapped the vinyl around the backing plate and stapled it on the back where they wouldn't be visible.
For the power I just ran an extension cord tucked in behind the seats along the port side, and left the end loose. We just plugged it in to the galley outlet when we wanted to watch TV, and hid it when not in use.
Hope this helps. You'll probably be done long before I'm up at the boat again. But I'll try to remember to take a picture.
Scots.