Building Assassins Creed Cosplay

I'm working on a cosplay of an assassins creed character.  I have the outfit, but finding the right hidden blade that fits with the costume has been difficult.  I tried seeing if I could buy one online, but they're real expensive and some weren't even the right ones.  So, I decided to make it myself using leather for the gauntlet and aluminum or a sturdy plastic material for the blade. Since the blade is spring loaded I'll use a drawer slider and some springs for the spring mechanism.  I'm definitely going to have my hands full with this project, but it will all be worth it in the end.