I know the title says 'challenge' but I suppose it's more of an idea, really. I was skimming YouTube looking for something interesting and I found this: [ame]http://www.youtube.com/watch?v=CuRBpApmfx0[/ame] it's a bullpup vertical crossbow. This concept is entirely new to me and I thought, 'what if this could be made from thera band and plywood? maybe with a draw extension too?' The possibilities are unending and I thought I'd post up here straight away! So! I'll try and look into this a bit more but to Jörg, I thought it'd be a good idea to key you in on this and maybe y'know drop you an idea. I think this has a lot of potential!