Hi, Emmanuel, that's a good article.
On this drawing it seems it is just a pentaprism not an Amici roof prism.
Regarding your question about the prisms; The linked drawings do not show the roof faces, only the profile of the prism. When you use rhombs for the turrets as the APMs do, the image orientation is not changed by them. To get the correct up/down, left/right oriented image that we want with binoculars, a Schmidt roof or Amici roof is necessary as they provide both the 45° or 90° deviation as well as image inversion.
If a semi-penta or penta prism were to be used with rhombs as you suggest, you would get an upside-down image. The image is passed through the penta prism directly without being inverted. Only the deviation angle is created. When these prisms are incorporated in the design, the large 'tuna can" Porro II prism turrets are required so that the image will be upright. This design is common to Vixen BTs, some Miyauchis, the Oberwerk BT100 and all previous 90° BTs from China I've seen so far.
Edited by Rich V., 26 January 2015 - 01:40 PM.