Everybody’s had an idea for something cool, but some think that it would be beyond them to make it real. Wrong.
Instructables, a fantastic repository of step-by-step instructions for how to make just about anything - http://instructables.com/
A resin mold casting tutorial - http://cast-a-walker.blogspot.com/
The Backyard Bowyer, a guy who puts up comprehensive guides to making your own PVC bows - https://www.youtube.com/watch?v=rmxn-nPNhY8
The Replica Prop Forum, a community of rabid movie prop reproduction fans who know how to make everything from Stormtrooper armor to movie-accurate Borg cubes - http://www.therpf.com/