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Alright, I've been going over this for two nights now and I'm only barely making progress.
Sadly, that's probably because of dumb luck and not any skill/understanding yet.

I tested more transistors or at least made sure things weren't loose. I also swapped one from the B trigger for the one that I found was going bad.
I don't really think that fully helped, but I am starting to at least get the start of a test trace.
It still only shows while pressing the beam finder.

So it does seem like things are working except for the vert amp. Here is where I'm stuck.

This is what I know: schematic shows that pin 9 from U470 (vert amp) should have about 36.6V+ I see 34.3. Pin 12 shows it should have 32.5V+ and I see 32.7.

Not sure how much that matters yet, I just mention it because I measured it and it seemed odd.

Next: I have re-read the suggestions below, from HankC, and I'm honestly lost. I can't see where the board appears to be a folded image of itself. I've stared at the preamp section as well as the amp (which is after the delay line, after the switch, if I understand the diagram correctly).

Here are the answers to HankC's questions, maybe that will help more:
Right now, the power supply readings are within spec. I'm particular and so I'd like them to be closer but they are currently within tolerances. Resistance to ground doesn't match in each case, but right now nothing is completely shorted or completely open.

If I short the delay line, I don't see the trace. If I do it while pressing the beam finder button, it effectively starts to bring the square wave back to a line. Correct me if I'm doing something wrong here.

Things are the same regardless of channel. Pressing invert on CH2 does seem to affect the trace shown with the beam finder. Also, things like triggering work how I would expect, and I can move the trace around (including the angle). I just can't get it to work without the beam finder at this point.

Just so I'm clear, for the shorting process, are you talking about the delay line on the amp board or the preamp board?
Staring at the vert amp board, or the preamp board, I just can't clearly see which section is supposed to be the set of matching sides. I may be looking too literally though.

I just tested U450 for expected voltages and nothing was grossly off. Things were maybe 200 mV off in some cases, but nothing like entire volts off or negative instead of positive. I realize that the mV may still make a difference, but I'm just pointing out that the output sides made sense based on the inputs.

I look forward to some clarification of what board I should test at this point (based on my answers). Also, if I'm doing something wrong, please let me know. I'm anxious to conquer this task and move forward with the next one (as well as furthering my education with this stuff).

Also, if I center the horizontal control, I get voltage readings (at the lines going to the plates) that are not at all as expected (based on the schematic's blue lettering). The left plate is roughly 64.4V (schematic shows 48.1) and the right plate is 34.4V (schematic shows 52.1). I assume that's just an additional issue, not related; again, I'm just adding things I actually know. Odds are high that this will be just another item to review once I can get things up and running and calibrate the machine.

Thanks, as always.

-Josh