Don't quite need the ottoman but this might work for the bench I'm looking to do. How to Build an Upholstered Storage Ottoman. This gives you the measurements of every piece of wood and fabric along with a list of what tools you will need.
Build it: DIY Upholstered Storage Bench- GO WITH CHAIR-and/or at then at Possible storage for play room - LOVE the yellow and the gray chevron print fabric! Want 3 in the living room for extra seating!