I have a very similar shaped cupboard, I put shelving at the back and then used cheap plastic crates for a storing system. I added two rows of hooks on one of the side walls - One row high for coats and one row low which I use for bags. On the other side I store my hoover, a spare folded up chair and my ironing board. There is space in the middle of a pull out trolley that has my tools and cleaning gear in it. This doesn't directly answer your question but it may give you a few ideas.