Actually those monitors are quite easy to sell. Donkey Kong series builders and restorers buy them up quickly.
Now, onto other things.
Howard you are usually right about general Mame and control type stuff, but most of your knowledge about original games and cabinets appears to be secondhand. and if often incorrect.
Anyway, as someone who has actually owned Nintendo cabinets (and MANY others), I can say for sure that they are a wonderful cabinet, light, yet still sturdy, they have nice wheels in back, and the control panel designs on most make it simple to make your own panel for them.
Also, you DO NOT have to use the chintzy nintendo playchoice sticks. They can be replaced with other sticks with no real issues. They DO have a different bolt pattern, but that isn't that big of a deal (if you use Wicos then you can just drill new holes in the wico bases to mount them to the nintendo bolt pattern, otherwise you can usually make some sort of mounting plate).
The thickness of the walls of a cabinet have absolutely NOTHING to do with the type of controls you can install on it. I am not even sure how you made that connection? As for the Nintendo control panels themselves, some are wood and some are metal.
I am not big on assorted t-molding colors, so I can't comment much on that, except perhaps to say that standard sized t-molding actually looks just fine on Nintendo cabinets, it only overlaps a tiny bit on each side.