Fernando Sola Ramos
Pilar de la Horadada
The Panzer Pusher gives you prestige!
Question 1: Does that mean, an enemy unit is not allowed to use Overwath Fire vs. a crawling unit?
Overwatch can be used, but no spot/move marker is put on the crawling unit. As long as the crawling unit is seen by the overwatching unit, it may be fired upon.
Question 2: Does a crawling unit suffer the GP Defense -2 for moving in addition to the +10 GP Fire Mod for Target Leg Crawling?
No. As you have said, crawling is not considered moving for combat purposes.