Chad, it might be safe but as others have said, you really need professional input on that. The problem is that "this looks solid" isn't a reliable way to figure whether the consstruction is going to hold up against the worst possible open water
or pitchpole that may, effectively, impact your boat against "solid" water
at fairly high speed. That can be an impact similar to smacking into a concrete wall at 40+mph, to give you a fast ballpark concept
In the Fastnet race
, the doghouses were literally torn off or smashed in on some wood boats, which is why the entire construction of a modified cabin
area has to be questioned.
I would suspect that with professional evalution of what you have, if the woodwork is strong enough, you might be able to add 3/4" Lexan
storm windows over the entire hatch
area, and make it reasonably strong for bluewater use.
The ideal goal is to make the entire deck
as strong as the hull
itself, but even if that's not possible, you should be able to make all that open glass area much more resistant to something like green water (or rigging) dropping on them. That's a much more likely impact, and more reasonably defended.