There is a Lindberg 1/72 kit, mine is numbered 505-130. I hear there was also a Revell kit but I have never seen it. There is no 1/48 kit, closest would be the 1/48 Hasegawa kit of the SH-3 and a lot of conversion work. Attic models did a resin conversion set that was not well received.
I have a lot of pictures of an Air Force HH-3 here:
yolo.net/.../hh3.htm