THAT old timber ladder in the shed may be past its use-by date as a safe way to climb — but it can scale the heights of chic as an interior design option Still in the bedroom, a short (or cut-down) ladder makes a trendy bedside table. “It could be treacherous,” said Martha, an interior designer and owner of Martha O’Hara Interiors On the second floor, the O’Haras reconfigured bedrooms to add a