Combining solar panel strings with different azimuth
It depends what your priorities are.

First, combine all panels with the same azimuth (same illumination) directly (series, parallel, mixed, doesn't matter), and make each different azimuth combination have the same nominal voltage. 

If you want a long charging day, cheaply, then combine the different directions in parallel, each with a diode in series with it. This will prevent dark directions robbing power from illuminated ones. The brightest direction will deliver almost the entire load.

If you want the highest total output, and are willing to spend a little more, then connect each direction to its own MPPT controller, and combine their outputs. Then even poorly illuminated directions will add as much as their light permits to the total output.