First is a jump pack, it will differ a bit from the one shown here but general feel will be the same.
First thing to do was make a basic box out of cardboard filled with styrofoam (to prevent a backpack being crushed).
Then it was all covered with plasticard, more plasticard was added to form a shape and even start some decorations. Hoses were added to simulate power feed. 1cm thick plasticard bordering was added to enchance visual effect:
Start of the decorations, Inquisitorial -=I=- symbol base - it is pretty small, 18x36mm.
And something else - belt loops for equipment got overhaul. They are made of leather (recycled old handbag), painted with a mix of ink and alcohol and connected with rivets and small skulls were added to hide rivets.