I don't think it would be tippy. From the bottom of the seat to the floor it would be a standard office chair. It's just the chair part that would be different. I was saying a motorcycle battery for the amps. A computer power supply puts out the right 12 volts DC but I wonder if puts out enough amps to make the motors work, plus I didn't want any wires going to the chair. I suspect that the battery would have enough charge to do whatever movement I would normally want for quite some time before needing a charge. When it does I could just hook up my shop battery charger overnight and I'd be all set again.

I already have the neccessary office chair parts. I just need the right Mercedes seat to move the project to the next level. My W126 seat is really comfortable, but I haven't found one in any of the yards close by. I was hoping a C220 seat (close by and cheap at $50) would nice as the one in my 300 SE, but chance2benz says no way! There's a 98 S-Class seat available on ebay but its quite a bit more and I don't know if it as good as my W126 seat. Can anybody give an expert opinion on that? I'm willing to spend the extra dough if it's as great a seat as the old W126.

__________________
2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire