This same question was brought up over on the other forum concerning a lift out/ up section.
For a lift up to be anything less than aggravation it needs flanged bearings and a metal cross shaft not nuts and bolts . Nuts and bolts won't give you the precision you need so it'll line up every time. Line up is usually a V over V done by using angle iron
One piece on the stop for your lift up ,one piece on the lift up itself.
When they come together the two V's will lay the same way every time.
The frame should be heavy enough that you moving it won't knock it out of place and held together with screws and glue.
If the lift out is fairly wide/long a counter weight should be used for ease of use and to insure you don't knock it out of alignment trying to heft it.
A heavy duty momentary switch should be incorporated into the design so that when the lift up is in the up position it kills 10 feet of track on both sides of the lift up.
This is so when your wife comes into the room to talk to about something , the new topic won't be your thousand dollar engine laying in the floor.
The lift up can have power up and down if you desire . You can use something called a linear actuator (Google It) It's basically a motorized piston that extends out a certain amount and come in various sizes with load ratings up to ten thousand pounds.
A simple double pole double throw center off momentary switch will give you up and down operation.
I know this sounds like overkill to some but if you'll take the time to do it right now,
It'll pay off down the road.
David
