You have seen the original to know what it looks like, right?
To build one, the big design parameter you need in mind is it needs to act like a straight extension. That is, the end that will recieve the torque wrench must be in a straight line and centered directly above the bolt head, thus keeping the center line of the wrench perfectly perpendicular to the center axis of the head stud. If that parameter is met, you can make the offset part any way that suits your fancy, so long as it is rigid enough to maintain that positioning during the loosening/tightening process.
If I were doing it, I'd start with a 12 point box end wrench and work up from there.
FYI, I changed head gaskets last year. I broke the military head bolt wrench taking off the heads and ended up getting a socket welded to a box wrench( sorry no pics). I then used the military head bolt wrench to torque the heads back on after the threads were cleaned up and oiled. Good luck
After the one I bought from Saturn took a crap on the 1st torque, I made this.
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Pics or Specs of fabricated Head Wrench
