May i suggest you draw up a plan of who exactly is to be allowed on board -if Rindy's ark is already full you may find you and your shed become very popular and you'll have to control a stampede of would-be survivors.
Agree fully -no kids on board, some useful animals and a crew are necessary - have to think about re-populating the world once the waters subside don't forget...
2 by 2 could turn out to be useful in the calculations.