Thanks for the feedback. I like the idea of a moveable lift as they do take up a lot of room. I'm not sure what will need to happen to beef up the lift area. What I'm wondering about is a sanity check on the builders advice of adding it later. I do want to save money, so can't see pouring the whole foundation with extra thick concrete. I'm wondering what concrete/construction to ask for during the initial build. Would rebar be used and will that make adding the lift a pita in the future? So much I don't know...