Go on jakobud's site and look at the Moon Patrol cabinet.
http://www.jakobud.com/If you look at the side profile and just extend a straight line down from the control panel to the floor, you should have a Robotron cabinet. Check out the attached drawings. The first one is from Jakobud's site, and the second one I drew in the line to make it into a Robotron cab.
I was gonna do this and build it until I was able to purchase a converted Robotron cabinet. It had a working Capcom game in there, but it was definitely a Robotron cabinet, and I practically stole it for $80!!! No side art though

some sadistic lunatic

had taken a belt sander to the original side art, then covered it with cheap black formica. The formica was falling off the sides when I got it... Very sad indeed. But I will put things right soon.

I am out of town right now and cannot measure my cab and compare it to the Moon Patrol plans, but they are very similar cab styles, and I don't see why there would be very much difference.
I will take some pics and measure it when I get home next week.