Jitender Bhai itinerary is OK but the Srinagar to Leh part will be a very long journey. You will end up driving in the dark definitely and reach Leh by late night. Rest of the plan is doable. The easiest stretch between Pangong and Moriri is via Tsaga, Loma, Mahe and Nyoma. Other routes are actually more difficult and not doable in a WagonR.