This IS getting rather interesting, since the 8YP4 would not work for some reason, checked 2 times, it was hooked up right, and still waiting for the 21FP4 from dieseljeep to be shipped, which I hope to be the final CRT for the completed project.
But as mentioned, since the 8YP4 was not compatible, I'm using my 21AUP4A/B for now, but the method I used last night of laying it down on foam pads and cardboard boxes is NOT the safest way to do this, not to mention, I really need to extend the CRT and yoke wires a bit to give more room to place things safely.
After thinking for a bit about how to do this, with a bit of searching I found a giant hose clamp. :O
Big enough to fit around the screen, so when I get it, I will attempt to build a base to strap it safely down to for testing, it will look very strange when done I think!