When I did mine, it was a similar method to you suggest. ( only minus the friends
)
I had 2 thick planks running the length of the sills, probably scaffolding boards, 6-8" wide, 2" thick ? To remove the chassis I used 2 trolley jacks and simply went from one side to the other slowly raising it to the max lift. Then it would be secured on 2 axle stands per side, rinse & repeat the process. Once the axle stands were as high as I felt comfortable with, I used anything to hand to lift their base high enough, bricks, 4" fence posts, anything.
I rolled it out and back in, complete with engine & wheels just as you're proposing.
I don't have detailed pictures of the process, but there was a lot of shuffling of axle stands & jacks going on. I was a bit stuck for space so didn't have any other option really. Someone on here recently posted a shot with a custom built wooden framework and ropes/pulley to lift the car (Leftangle ?) which looked a neat approach.