How I made a large upholstered ottoman from the IKEA LACK
I took apart the LACK coffee table and chopped the legs from the bottom. I left the metal braces already on the legs so I could reattach a new shelf. I reused the hardware to attach the legs to the new upholstered plywood top. Because I made the top larger than the original lack I had to build a new bottom shelf. It is attached by chiseling out notches on the bottom of the shelf and resting on the metal shelf prongs made for the LACK Coffee table.
I thought about not hacking the LACK coffee table and doing this all from scratch but after pricing out the costs of 4 legs, leg hardware, and hardware to attach a seamless lower shelf, the $19.00 LACK Coffee Table and its materials was much cheaper.