Ya it looks like there is no support and everyone probably wanted to sit there, getting the chassis out looks like it's going to be a project in itself.
Absolutely, be sure to keep track of H and V and just use wire nuts until you know they are correct and you don’t have to swap either set if you get a mirror or upside down image.
Here is another great option with the VGA.
https://www.phoenixarcade.com/products/arcadesd/arcadesd-pcb-us-shipping
But if you want the original to work reach out to gamefixer.