It doesn't make sense since it's just saying two things "once, on board a ship for 42 days, there was nothing but sea as far as the eye can see." + "to try to say in Japanese" without any connection between them.
I would say :
こんにちは皆さん
"once, on board a ship for 42 days, there was nothing but sea as far as the eye can see."を日本語にしてみようと思います / してみました
一回、船中で42日に見渡す限、海だった
これで意味は通じますか
よろしくお願いします
Mike-san' advise "even get away from a direct translation altogether and use something functionally equivalent" also works here.