I'm planning there in April... same like yours... one side by air and return by road... that'd be much fun... and that'd be a 10 days trip..
thats really nice. Do remember to share ur experiences at the end of the trip.
i heard that there r approximately 4 shangrila resorts on the way from isb to skardu. i have a KKH map in soft copy. if u r interested, i can send it to u, but i need ur email address for that.
Gilgit has a nice serena hotel. do stay there. In hunza, u will find HUNZA BILTIT INN.