Fully automatic 9 target practice range

I have made a fully automatic practice range for the bow and arrow. It includes 9 targets and one of them will be chosen by a randomizer so you dont know which one and then you have to shoot the minecart which will refill with another minecart and play a tune as you've hit it. A light will also turn on corresponding to the target hit. If you miss though, no light comes on and a different tune plays.

It took me roughly 2 days to build/invent. I used fvdiscos design for the appearence of it and the minecart system and cubehamsters pseudo randomizer.

This is my first ever invention so dont be too harsh ;)



My youtube channel: http://www.youtube.com/user/TheDomB3?feature=mhee