Why?
If you don't want to stand up, buy some stools or buy a candy cab.
Please don't ruin that beautiful beast.
I have two candy cabs and use stools while playing both (check my profile). I'm going to move the cab into my office with the rest of my arcade stuff and would prefer the cab at sit-down height so I don't have to buy extra stools for it. The cab height is adjustable, there are locking bolts on the side supports that say "up" position and "down" position, so it won't ruin the cab.

As far as I can see, it's just the two bolts that secure it in upright or sitdown position. I'm going to have a friend come by tomorrow to help.
@Arcade ben,
I'm probably going to keep it as a Tekken 5 cab. It is in about 98 to 99% condition. Just some scuffs on the lower metal side panels. All the decals and stickers are perfect. Everything is working except the card "feeder", going to try and fix it, but if not, oh well. Wouldn't mind upgrading it to Dark Ressurection if I could find it.
I got the cab for a steal, 500 bucks. It seems like the guy just wanted it gone. He operates a PC arcade and no one seemed to play it. The card readers had issues 'cause someone stuck some change in one of them.

He didn't seem to know much about the cab, but said it cost him 6,000 when he bought it new a few years ago. This is probably the best find I've had.
Edit: I think it does use an HD TV, I'll have to open the back panel to find out, will let you know.