" Arived on the west coast, probably in Guatemala. Lived there a few years. Lehi died. Laman and Lemuel get upset with Nephi. Nephi and his group take off to get away from Laman and his group. Nephites move inland - probably to the highlands of Guatemala. A couple hundred years pass. The Lamanites come close to destroying the Nephites. Mosiah and a group of Nephites escape to southern Mexico. They meet up with another civilization, and Mosiah is made their king. Most of the book comes after this point.
Unless the Nephites were somehow able to bring a ship up into the highlands of Guatemala, the ship must have remained behind in the hands of Laman and Lemuel. Given that they hated Nephi, it isn't unreasonable to believe that they destroyed the ship that Nephi built.
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Speaks for itself, your just repeating what's in the LDS book, with a few hearsays thrown in, such as ' not unreasonable', ' probably' ect. Which means your guessing. There's nothing wrong with you believing in your book, as long as you admit it cannot be backed up by any evidence which can be subjected to scientific peer review/
~M