i forgot to make step-by-step pictures.
so this instructional is just to inspire you building your own bow :)
Step 1: Needs
the tools i've used were a drill, a metal saw, a belt sander, a handed angle grinder with serrated discs, a planing machine and clamps.
Step 2: Bow Pictures
Step 3: How To
you'll understand this construction autididactic by looking at the pictures above.
ski poles are potential arrows, but they won't fly as well as real arrows.
i hope i could inspire you to build your own bow out of old ski.
have a nice day !