Moving on to the bottom ribbing mold rather than dwell on the first failure, I was more careful to cut small pieces of cloth and build them up, in an attempt to relieve the wrinkles, and only laid a whole sheet on the very top to back everything up.
This came out pretty good, at first. Yeah there are some cracks but I can make it work.
Here though, I had run out of polyester resin and rather than delay to get more, I used two part epoxy resin I still had a lot of. And I mixed it poorly, and it didn't harden right, and this mold sagged to uselessness. This was really disappointing.