I should be able to help you out with your questions.
As for the Centurion antennas over time the antennas changed in number and location. You are correct about the front left mount. But sometimes the tanks could be seen also using the front right mount as well. This gave a two frontal antenna mount look. The rear mount was on the left rear....this was changed to the right rear when the tank were upgraded to the Mk.11LR. Some images show the two front mounts and the left rear antenna mounts all with antennas at the same time...likely command tanks. In the 1950s and into the early 1960s the single colour Centurions could also still be seen mounting the older British antenna mount with the circular guard on the right rear mount (I don't know the name for these old WWII type antenna mounts).
The M113 colours can be a bit confusing as there were actually multiple camouflage schemes used or trialed through the 1960s....much like the Centurions (there are six distinct Canadian Centurion paint schemes I have been able to identify). The B&W images don't tell the whole story with what the colours looked like and how they evolved to the colours used in the 1970s and onwards.
The colours you see on the M113 in the link you posted and the M113 w/ SS-11 in the book are actually a three colour cam pattern of black, a faded olive green, and a very yellow toned khaki drab. They are hard edged colours. The call signs are in yellow on the hull sides. The actual pattern of the colours is different than the later Canadian pattern seen on M113s through the 1970s and 80s leading up to the NATO cam.
Funny you mention the M113 w/ SS-11 missiles...I am building a 1/35 version!