hey there! sorry to hear about you havin to stop shooting your bow. i'm a horton crossbow shooter and i'm not to happy with what is happening with my rig right now. it's high maintnece and it's noisy. if you decide to buy one, go excal. you can go to
www.crossbows.net and look around. i dont know where to find any plans for an old crossbow like your gonna build but i hear they're fun to kill deer with! have fun and be safe!