In Australia a 2 seater conversion was done by Fieldair Ballarat in
state of Victoria (my old contact Kevin Howard). This was done many
years ago. Another firm Gippsland Aeronautics (also country Victoria)
make a Pawnee look a like called a GA200 (or Fatman) and they have
exported them to USA, NZ and Asia. Bit expensive but remember it is
new - they have done a good job. Contact is Peter Furlong or George
Morgan Try a search engine ........Ian McPhee Byron Bay Australia