You don't bend the wood to the radius of the hatch. Just cut it out of plywood to the radius of your profile. The Benroy plans should have a detailed way of doing it.
I personally just took some paper and taped it up to the opening of the hatch on my profile and traced it. It gave me the exact curve I needed for the hatch opening. I cut out 5 ribs to that template.
By the way Norm your teardrop is coming along nicely. Keep at it and you will be camping in no time
