Yeah, I see what your saying Paigeoliver, but I could pull off the metal bits as the only ones you really need the same are the legs. I could make those with a few lenghts of pipe of diferent diam. and some RHS.
Weld a nut on the side over a hole in the outside peice of pipe so you can lock it at the height you need

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As for the rounded edges on the tob section of the bottom, your could use a router to take off the square edges once that section has been assembled. Just use nice thick MDF for that section only and good strong joints. Ive got a dove tail bit for my router that ive use to make some drawers.
Yeah, I know what your saying Grasshopper, but it wouldn't "feel" right any other way for me. I last used one of these cabs about 2 1/2 years ago when I was at Uni. Thats in Nothern NSW an I live at the other end of the state, a good two days drive from here - bit too far to go just to measure a cab (ive considered it though). Ive seen designs with horizontal CP's, but I just dont like the look of them, they look like what they are, boxes "tacked" onto the side of the cab. If I built it, I would always be unhappy with the way it look.
As for the confort factor, this was the first kind of arcade machine I ever played, so I guess it comes down to what your used to. You kinda lean over it and hold the stick between your middle and index fingers. Fire with your thumb on the other hand. The one in the pic has euro style tops on the joysticks. Dunno about there in the UK, but here we had ball tops.
Mega thanks to Captainpotato - you rock man!!! Im currently building my upright cab, this one is going to be the my next project, but I will post here once it is underway, in the new projects section.
Thanks to all who responded here, keep this thread going if anyones got any ideas that might help.