hi there...just to give u n idea about cutting body holes like what i did and as per ifmar r/r:
-front window, round hole not more than 60mm or 70mm?
-rear window, the hole wind screen as long u don't cut the window lines..this will give more cooling air to the engine ( the cooling air mostly comes through the rear not the front)from what i was told.
- 1 hole for antenna, 1 for glow plug heater
-as for the side window 1 on each side not exceeding the window lines
even just for bashing this holes r enough...u need not to follow
...looking from your pics i notice your 'air filter' r pointed backwards...try to point it forward so it 'catches' cooler air...correct me if its wrong...thanks