Foudn these on ebay - made to measure for the height of your room!!!
cgi.ebay.co.uk/Triple-bunk-beds-Tri-Bunk-bed-3-High-Bunk-Beds_W0QQitemZ230347535835QQcmdZViewItemQQp tZBedsMattresses?hash=item35a1c875db&trksid=p3286.c0.m14&_trkparms=65%3A7%7C66%3A2%7C39%3A1%7C240% 3A1318%7C301%3A0%7C293%3A4%7C294%3A50
Don't actually need any anymore but there was one time it seemed to have been the only solution.