While we don't know the full response Nephi makes to the Lord's request, it is interesting that the only record we have from his is such total acceptance and reliance on the Lord that Nephi's first response was to ask were to go to find the needed raw materials.
It is also obvious that Nephi is not giving us all of the details of the conversation with the Lord, because he indicates in verse 9 that the Lord as, at this point, shown him the ship he is to build. That must have taken some time in the vision, and that and perhaps other information is simply not presented. For Nephi's purposes in writing this part of his record, the spiritual information is of much greater import that the mundane details of building a ship sufficiently seaworthy to sail to the Americas.