Shame, lovely rare cabinets. Just out of curiosity why didn't you use one of the countless taito cab shells you see being sold?
If you're going to butcher it, you might as well do it in style and rip everything out including the control panels. I'm sure the joysticks are only 2 way and you have just 1 button, meaning you can only play a dozen or so games from the 60 in 1. You need an 8-way and 2 buttons.
My upright space invaders has been very reliable, but it's like owning a classic car, you can't just buy it and expect it to work indefinitely without maintenance and having key skills like being able to solder, using a MM etc..
Andy