We'd had an idea to somehow add under-bed shelving to a
MALM king bed using the
LACK shelving unit. The original thought was to add legs to the MALM and slide one LACK under each side. The problem came when we couldn't find a way of attaching legs that satisfied both my structural/safety concerns and Jennifer's aesthetic sense; either they'd be attractive but too small or not well-attached, or ugly but bulky and secure.
The beginnings of a solution came from an
IKEA Hacker post on headboards which linked to
aerialsoul's MALM headboard hack. The main inspiration we took from this is that the best way to add to a MALM bed is to just buy another set. We're using the headboard from one set as the footboard, and our headboard is made from the second headboard sitting atop the two footboards. Everything works together to make a cohesive, connected bed. We couldn't be more pleased!