If only you weren't so far away (shipping) and I hadn't been unemployed for the past month. But I am going for a job interview tomorrow. I'll message you.
Great game and one of my favorite. Don't truly know what they are worth but I'd gladly pay $500 for one with a decent cab, repairable PCB and monitor. Congratulations!
If you are sure you will never return it to original then I would pull the old harness. Sell it and any other parts like pcb, marquee and whatever. Put that money on a new jamma harness and the other stuff to complete the project.
When I brought my first 3 games home back in the 90's my wife didn't get it. Now she plays more than me and has several of the house high scores. It's been the same with guns, hot rods and motorcycles. Overall she is very supportive...I am blessed.