Considering the raw size of the ships this would be an incredibly huge undertaking, and there's really no need for it.
That depends on your goal. The reason I would like deck plans is because I'm planning a tabletop rpg for my group. Since they would be playing marines instead of pilots, deck plans would be handy.
Specifically, I would want pre-Great War deck plans, and I would be more than happy to do what I need myself, if I knew where to get top views and side views of them.
As was mentioned a while ago, there is a project building a Fenris in Minecraft. It even has a thread, the relevant part starts about
here. Not much in the way of a real floorplan is done yet, but the project is moving quickly.