as the owner of a little dutch yacht; i know it can be frustrating trying to find metric designed items in a 'measure by inch' world. you could easily replace the entire hatch with one slightly larger, enlarging the existing cutout to accomadate the lower section. i have installed new hatches on the coachroof of my
fiberglass yacht, and it is not difficult at all and these had to be up to boarding seas, something you will hopefully never encounter on your travels! measure twice; cut once, use top of the line caulking. that's it. it might actually be easier to increase the hatch size by at least an inch or so if you are using a saw as it would be demanding to cut less than that, otherwise you would have to use a grinder or rasp. taping the area you are going to cut beforehand will reduce splintering. good luck.
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