Good on ya for making your own Class of 81 cabinet and marquee. I have to say though, the first time I saw that cabinet or even pictures of it, I thought the artwork was a bit uninspired. Mind you, I am not slamming you at all, because you didn't create the artwork for the cab of course. Since you are making the cab from scratch, I would suggest being a little more creative than namco was. For gOD's sake, all the did was resize two marquees and slap it on to one marquee.
So what I am suggesting is to play around with it a bit more. That is unless you plan on selling this as a faithful replica, then, you might want to be as accurate as possible.
just my opinion is all.