most of ur queries are answerd, and well answered....
dont even think of treking from raikot to tattu, even on jeeps this is road to hell.......
when u reach tattu only then u can say that u r at some hilly healthy area, but b4 that, its roacky rock.......
tattu to FM is great trek, u can nwatch my thread, in which i was there 2 years back with my bro, bhabhi, and kids, v did it around in 4-5 hours, but can be completed in 3, or even earlier,
there are many huts available there, u can chk in the threads, there are more than dozen thread of FM, in last 2 3- years, details with pics will help, and also contact numbers, available......
v selected and stayed at Broad View Resorts, Fazal ur rehman 0312-9705843, 0312-9852840, 0313-9941086, and his younger bro hayat jan, they can provide all sorts of booking and facilities from raikot till FM, and then stay at FM and camping as well.......
open camping might also be allowed, there and u can do gthat as well......