I notice the lid did distort a little. I tried steaming a number of planks at one time, which did soften them all, but noticed that if I started bending a plank then put it back in to steam some more it would have memory and go more or less back to its original shape i.e. almost flat. Therefore I only had partial success. I did, in fact start poking the plank in at the steam end to re-heat while shaping it, so not much better than the simple pot with handle removed idea posted after my post. What worked best is using the fabric steamer head alone to steam and start shaping the plank, then steaming more after initially attaching the bow end to the hull. This allows me to get it closer to the bend and twist needed to run the length of the hull. I'm also going to try just two racks in the steamer and a weight in the middle to give some initial bend.