Support hull when replacing stingers?

[oteps]

Havent done it yet but mine needs new stringers. I would do it the way you are but take a measurement across the top to make sure it doesnt spread when u take the floor out. May have to use a ratchet strap to hold it where it it supposed to be?
Look through the myfathersson post. Its long but that guy did some good work. Not sure if its finished, he hasnt been on in a while. Hope he is ok.