I said in my group that I will post this, so here it is.

I was fiddling around with my crossbow and came to this.
This is a normal bow that uses a chain of thick rubberbands, so it needed to be very sturdy and after i made it very sturdy, I believe it will even survive if you let it fall down the stairs.

I found that it was near impossible to let it shoot grey knex rods, so I chose for wooden or plastic arrows.

NOW FINISHED
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The camera works better in daylight :D
And is even better then on the pictures i posted :P
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Step 1: Build the Inner Frame

You might be very familiar with this part if you made my crossbow.

Pic 1: Bottom halves of inner frame (dont forget to stick on the green rods :P)
Pic 2: Top halves of inner frame
Pic 3: Combined halves of inner frame

Step 2: Combining Inner Frame

This step can be very hard, you can make this however you want, as long it sturdy.

If you try mine then here are some pictures

Step 3: Making Bow Sturdier

pic 1: Just add the rods as shown in the pictures(Please use Yellow rods instead of the Red rods!)
pic 2:
pic 3: Add this to both sides
pic 4: Add all these damn pieces on the other side aswell, after that connect the green rods first, then see next pic
pic 5: Add the white rods including the grey connectors
pic 6: This is how it should look like by now
pic 7: You want 8 of those things
pic 8: Add them to the grey connectors on the front
pic 9: Put them on the back aswell
pic 10: Make these
pic 11: Make 4 of those
pic 12: Connect it together
pic 13: Take the yellow rods with wheels off and put the very thick rubberbands around them
pic 14: Stick them back in place

Step 4: Loading and Launching

Slide your arrows through the hole in the middle and then against the rubberband and pull it back.

Do not fire at siblings :P
And do not fire at living things either, cause if you use proper arrows you may injure them XD