Some in south TX, LA, AR doing it with Yanmar. Seen them converted with Duetz or Perkins too. Engine, labor and fitting is the main expense and if you spend too much for a bit more might as well go buy a new 200D with a warranty or find a used one with a diesel. Everyone is all talk till they find out what it cost to do and then don't have the $$$$ to convert it.
http://www.americanweldingsupply.com/specials.php