Look over the pictures of Jetpacks that you have collected and use them as a guide to design what you would like your finished jet pack to look like. Make notes of any bells and whistles you would like on it such as caps, switches and the like.
Create your exhaust system by using your dremel rotary tool to make a hole in the bend of the 90 degree PVC joint large enough to fit the 45 degree PVC joint snugly inside of the 90 degree PVC joint. Epoxy it in place.
Remove the backpack from your rigid frame along with any parts you do not want on your finished Jetpack.
Place your fire extinguisher in the center of your rigid frame with the exhaust assembly facing the direction you plan on the exhaust coming out of it.
Put both hide-a-key boxes on either side of the extinguisher so that the hinged tops open upward. Align the boxes so the bottom is even with the top of the extinguisher just where the exhaust assembly meets.
Remove the fire extinguisher and drill in two holes in the inside of each hide-a-key box and screw them into the rigid frame.
Place the tabletop paper try on top of the hide-a-key boxes and line it up to where you like and drill holes through it and through the tops of the boxes and affix with screws.
Mount the wall mountable paper tray, mouth toward the exhaust, on top the tabletop paper tray. Drill holes and thread with screws.
Place air filter on top of wall mountable paper tray flush against the mouth of the tray. Affix in place with a screw.
Epoxy the file dividers to either side of the rigid frame to form wings. Place them however you think looks the best.
Primer your entire project and allow to dry. Paint your air filter chrome along with any other metal-like surfaces. Paint the rest flat black. Use masking tape to mark off areas you do not want to be painted.
Epoxy your cardboard tubes to the rigid frame so that an end nearly comes into contact with either side of the exhaust.
Tape your fire extinguisher into place.
Attach one end of the long string to the trigger of the extinguisher and run the line through the jetpack, keeping it taut, to the trigger of the pack.