Jesse,
You can buy small photo-etched frets of hatches and inclined ladders from Gold Medal Models. They are around $5 per fret and very nicely detailed; various sizes of hatches (open & closed). The ladders come in several different types and also include accommodation ladders. Well worth the price. www.goldmm.com
If you really want to do the Arizona right, get the Tom's Modelworks PE Boat set. It's around $16 (if I remember correctly) and it really adds a lot of nice detail to the boat deck area.
Paul
"A man's GOT to know his limitations."