Have you considered an Academy 1/35 H-13?
I've got the Academy 1/35 Bell 47/H-13 (the USCG version), and it's a great little kit imo. Very easy to put together and paint, although I've not finished mine yet. Kind of lost enthusiasm for the model, and I have a 1/72 Jolly Green to finish as well as a 1/36 UH-1C I've part started...
I think if you get the MASH version you can build either a MASH or Sioux because my USCG came with parts from both kits, minus the clear plastic parts for the end of the stretchers, but I could have built it as a H-13 Sioux quite easily as the guns and skids are there. Different tanks on the top though, it only has 1 going across the frame rather than 2 each side, presumably one of a few differences between that and the H model.
Might be another alternative if you can find it, I got my USCG Bell 47 from Luckymodel.com.