0. It is a 25" or a 27" monitor not a 29" (29" is just what they call 27" monitors in japan where they are allowed to lie about the size). Also, it is overpriced. That is a conversion machine listed for $500. Last 2 auctions I went to had the dedicated ones going under $200. Operators are dumping old golden tee machines left and right now.
1. Static could be a lot of things, but that cabinet is older than the game that is in it so it could indeed be cap time.. Older arcade titles look way better on tube monitors than LCD.
2. You don't have to remove a monitor or discharge it to install an arcadeVGA. You only have to discharge a monitor if you are going to work on the chassis. That is it. No other time, ever. The danger of all of that is also way overstated in the various FAQS. There is a change you might have a tri-mode monitor in there like a D9200, in which case you would not need an arcadeVGA, but you probably will need one. There are also VGA to CGA adaptors out there, which are cheaper than the arcadeVGA.
3. It does not weigh 500+ pounds. It will be more like 375-400 (I literally just sold one in that same cabinet style a few weeks ago, and didn't even need help loading the thing onto the truck to deliver it). You do not need a special dolly to move it. A normal one is fine (even the lowest rated one you can buy at harbor freight is rated for 550 pounds, which is way more than this weighs). Just make sure the tires are aired up to max pressure if they take air (they NEVER are). I have moved many hundreds of these things and it really isn't a big deal. I can load and unload one of those onto my truck by myself. It can lay on its back just fine (always check inside to make sure nothing is loose though).