Just back from Siai MArchetti in Sesto Calende...Tons (well, kilos) of material on the 122 and 132, a later revised version of the 122, called OT (OgniTempo, i.e. all-weather), a smaller companion, the 112 (the three appear tohave been conceived togheter in 1953-53, covering the full spectrum of small to middle sized transports). Besides this I found the original drawings of the SM 105 (Canguro...), and more... You'll have to wait until Wedsnday September 20 when I'l return there and srrat seriously scanning and copying. For now, suffice to say that I have to make a correction on my previous post: the model of the SM 122 wasn't an early design, but an alternative configuration of the later SM 122OT from 1957. The flush cockpit design is, considering the year, clearly influenced by the contemporary Agusta AZ8L. In the end it seems (but I'll know next week for sure), SIAI returned to the original raised cockpit solution.
Uh, and the wind tunnel model was made of lime wood (I found the original detailed costruction plans for the model, with dimensions down to the tenth of millimiter)
And last, I'm really happy ;D