These Holo-Projectors are club-spec in the visible part, but have a dramatically larger rear access opening, and are very large inside, with two different "steps" you can use to mount electronics.

Each of these is a complete Kid-Proof HP with servo mounting hardware and slip ring. Be sure and select the HP location for each one as the mounting rings are custom for front, back and top locations.

The mounting ring position fixure is very helpful for installation. It's the same for all locations, so you only need to buy one for your dome.

If buying more than one, select shipping for the additional HPs as "Additional HPs".