I thought you'd get a kick out of the dimensions, but it gets better:
About 2/3 down
this page is another interesting drawing of the MTM with the Z-drive.
This site lists the number of MTM and MTM derivatives built in the 1936-1942 time frame (about 90 in total). The
Galleria Fotografica shows pictures of the
MTM on display at the
Museo Tecnico Navale della Spezia (WARNING: Beware of the loud and awful music on that web site!). This museum may be worth visiting for comparing the engine and hull structure. And, maybe their research library can tell you how many MTMs were destroyed during the war (it appears frog-men of the 10th Assault Vehicle Flotilla "
Decima Flottiglia Mezzi d'Assalto" pointed the MTM boats at a target, jumped off, and expected the mine in the MTM to explode on impact and sink the target), which may give you some insight whether your boat is a converted MTM or a more peaceful design.
And BTW: If your boat was indeed built or modified by Baglietto, it would make even more sense why it entered Switzerland via Geneva.
Isn't the Internet a wonderful research tool?