HOWTO turn a bathtub into an armchair or sofa

This is smart: recycle a bathtub into an outdoor armchair by slicing it in half and bolting the halves together, or do the same thing but lengthwise to make a weatherproof sofa. Link (via Cribcandy)

Update: Here's an alternative design from last year's Goldsmith's College Degree Show -- thanks, Isotonic!