And then there is Plan D...
I wonder if one could take an original Ericson woodie hatch, presuming that it has retained its shape, and put some plastic film over it and use it to make a mold. Then lay up a new hatch inside the resulting female mold. There would be some fairing involved to finish it up, but it's a small project, from the standpoint of materials and shop space needed... You could put foam core or balsa in the top surface, or even nomex honeycomb if you want to be really hi-tek. Paint it to match the boat with some epoxy paint or LPU if can afford it. You could even put an inset layer of teak veneer on top for the sake of tradition... Or, recess in a small acrylic "skylight."
Nice winter project, and the cool thing is that errors in epoxy can be ground out and re-done with little emotion, IMHO.
After that ego-boosting project, start building your new two-piece nesting dinghy to fit on your foredeck!
Regards,
Loren in PDX