The instructions for making this sling can now be found at Baby Sling Pattern for Mei Tai Baby Carrier
This is the best sling I have tried and I can't imagine mom'ing without it. My son is as happy in it at 17 months as he was when I made it when he was 6 months old. It is a modification of a few different styles that have been around for generations.
I've designed this sling to be worn with the straps crossed at the back, but you could shorten the shoulder straps and not cross them (I find crossed is way more comfortable).
It is also useful to add a square fabric flap to support the baby's head while nursing or sleeping. The flap can be sewn onto the main body piece and then tied or Velcro'd to the shoulder straps.