Thanks for your comments.
I have also realised that KLOV might be a better place for in depth questions regarding restoration of old original arcade hardware. I'll have to register there as well.
And yes, I am fully aware of the RAM controls story, but I really think that now is the best time ever to deal with them (Dan). I also recently discovered that Quartecade has a complete CP with controller for sale. So there are different options.
The downside of this business is the fact that I live in Europe (Sweden to be specific) so almost anything I want will cost me the double in shipping.
But for arcade perfection there is no limit I guess
The cabinet was a bargain, so there is room for more costs before I am even close to what at fully working game would cost me.