Warm Welcome Pete to APUG.You can buy your medium format camera from classifieds here. Do you know KEH Camera , have a look at there , their prices are very good. You can jump in to Pentax , Mamiya , Rollei , Hasselblad wagon or try a Zeiss Ikon or Kodak for very cheap to try the format. I am sure , you would invent or learn a way to fight with temperature control.