Hi NormK,
Great work. I've never thought you will start working on the scissor lift. I can see you're really determine to build one. The 60cm looks good and it proves the calculations. I think you can get away with 25mm square tube and it would be stable and rigid with cross members between scissors. The car scissor jack can be installed horizontally pushing the bottom largest cross member which takes most of the push. Also I've never thought about the drill the drive the car scissor jack. Just extend it on the side. Good idea.
Cheers,
TheCarbyMaster
