I'm glad you get interested in my homepages.
The software I use for modering M33 was Rhinoceros2.0and for texturing and
rendering was LightWave6.5.
It was very hard work to make these 3D filesand so I'm afraid I can't give the file.
I introduce "Macchi M33 pages"below instead. It maight be helpful for you building your Macchi.
All the best