RCR made stuff for the two Italian tanks. I've got the Semovente barrel (M02).
M01: M13/40 gun barrel turned in aluminium
M02: M40/75 gun barrel aluminium with resin muzzle
RCR also made a detail set for the 40/41. I've got one too.
Model Victoria is the place to look for the tracks. I have a set and wish I'd grabbed a couple.
Poke around MV's site to get inspired: http://www.modelvictoria.it/stepbystep_mezzi_en.html