I can probably help with the bike damage too. We've got some stuff at Starrware we're working on that start's off as a 2-part epoxy putty but molecularly bonds with and texturally replicates whatever you adhere it to- a pair of skilled enough hands should be able to shape it into whatever you need it to replace without having to special order any parts.

Heck, just bring the bike in to Starrware and I'll see what R&D can do for you. We don't make any weaponry so I can't help you with the crossbow, but you might be able to talk some techs into parting with some raw materials or something.