i have thought about this also, i was thinking of buying a manual stand from fleabay cheaper the better and then fabricating off that i seen them for under 75 bucks. That might be way to go then after that look for an air piston or cylinder to operate it.
I will be working on converting my cable operated stand to a 12V electronic actuated stand this winter. After messing with mine some last season, I determined there is not much room to work or tuck an actuator between the primary and trans, so I looked for a small footprint actuator with a 2" stroke that also had an external water\dirt rating. I think the one I found may be used by some of the builders, but never got any confirmation.