I'll keep that in mind when I build my harness, so it could lean back a little. Remember, according to comments and pics, that if it's flush to your back, the rocket will be touching and scratching your helmet as well, which will be annoying after a litte while.
I would get it as close to the backplate as possible at both the top and the bottom. If you let it lean backwards, it will just sway from side-to-side as you walk (trust me on this) which will cause you to wear the paint off of your backplate. Mine sits as tight as I can get it, and the rocket does not hit my helmet.
Ok, I am all ready to seal my MB JP. I have been glueing "L" brackets around the perimeter. I was planning to use GOOP as the adhesive and then 2-part epoxy to fill in the seal around the edge. I am very nervous about the back being that the straps< I am sure, are going to put some pressure when the JP hangs. And I don't want the seal to start to crack.
What are the straps going to? If you put a frame inside and are going to strap to that you won't have a problem since all the weight will be beared by the frame.On my first jet pack when I used the "L" brackets to close up the back I used 3/16" aluminum pop rivets into the holes on my "L" brackets since the holes were a perfect 3/16".Seeing the rivet heads wasn't too bad considering with the frame,and rivets that thing was strong as heck. I wanted to avoid the same thing with the seam cracking under any pressure.
Unfortunately I don't have any pics as I sold it for my third jet pack...........an RA fiberglass which was all done,and closed up when it came.
For filling in the gaps on the one in question I used bondo since my seam wasn't too bad.It just took mostly time and patience......oh and a couple of cans of filler primer for that glass smooth finish I start all my paintable props with that stuff.
Filler primer is a "plasti-cote" spray primer that is extra thick when applied leaving a heavier coat to sand off which in turn fills small holes and imperfections.
To line up the holes in my JP back with all the "L" bracket holes I put machine screws in all the "L" bracket holes and then painted a dab of red paint on each screw head.Then I carefully placed the JP back onto them being extra careful not to move,or rub the screw heads and get a perfect dab of paint on the opposite (inside) of the JP back cover.Then I simply drilled out the holes and pop riveted the back on.The rest was just a matter of filing,bondoing,sanding,priming,etc. ......you get the picture.