I am doing some glass work on the bottom of the keel of my Columbia challenger. The boat is held up with five stands, and two sets of blocks on the bottom. I am nervous about removing the blocks. I have seen some pictures of the challenger on a cradle with the entire bottom of the keel exposed but I'm not sure if the stands would support the hull enough to remove the blocks. My current plan is to start from the back and work to the front (so the seams are overlapping to be streamlined) then jacking the stern end up, put new blocks further back under the keel with shims, and remove the other rear blocks and keep working forward. Any other ideas?