1- The journey from A to B , where is A and where is B?
A: Masjid Haram = Mekka, location of the restricted temple (48:24-25)
B: Masjid Aqsa = Bakka/Jerusalem (land blessed around 17:1, 3:96)
2- How was the journey made? What was the mean of transport?
By the power of God (hence the reference "subhan/glory" to God).
3- How long did the journey take? Was it possible?
Same night (17:1). As for possible, I think it is a forgone conclusion that anything God wants to do is "possible" (raising the dead, etc..).
Also the "farthest Masjid" could be anywhere ( Only mentioned once) ,may be even not on earth? Why or why not?
You could be correct, though I would highlight the description "blessed/mubarak" which is used in a number of other references of a physical place here on Earth (Bakka, the place where Solomon would send the winds, etc.).