Your rotation-spool looks really cool, I hope you can add some more detail-photos of that? Especially I wonder where and how the motor is connected with it?
I really had a hard time to find out what a lazy-Susan is (well, I'm from Germany and I don't even know how we would name this things, but yes, my mothers kitchen has one build in, too
) I still don't know exactly what a fridge coaster is supposed to do, although I'm clear of what a coaster is (and this makes sense to me), but what on earth has it to do with a fridge 
Actually it is a Caster (wheel) not Coaster.
This is a view from the back. The monitor front sits on the fridge caster (used because of the double wheel). The back sits on the 2 side wood supports and bolts in with the 2 nut inserts in either side. The stationary part of the monitor spool has slots in it so the monitor can be moved forward or backward.

Here is the front view showing the spool sitting on the fridge caster. (Check out the bottom of your refrigerator , it uses the same wheels.)

Because the monitor is tilted back 15 degrees, you need to cut the front of the spool on an angle as shown below. Cut the Circle to size. Put it on a table saw with the blade set 15 degrees off vertical. Set the guide rail 1/4" inch bigger then the circle. Rotate the circle against the guide slowly cutting an angle with the blade. Keep moving the guide in and rotating the circle until you have a circle with a 15 degree angle on it.

This is the front without the bezel.

This is the side view of the spool. Showing the ropes used to rotate it. (I will remove the ropes and motorize it in the future.) The ropes go through the top of the cabinet with knots at the limits to stop the ropes from falling back in.
The back 3 boards are cut open in the center to allow the Kine Circuit Board and CRT Gun to go all the way back to the Lazy Susan. This allows it to save the 2.25" total of the 3 boards. Otherwise the whole assembly would be bigger making the cabinet 2.25" deeper.

And here is the back with the monitor spool installed.
