Hi Brian, congratulation on your armor....
Wes is right, its always good to have a lot of different tools. clamps and rare earth magnets will always help make the job easier. I like using both the exacto and the cutter, as the cutter will have more firm grip to it. At times i also like to use heavy duty scissors also. Another tool that good to have is a rotary tool, but you must be really be very careful with this tool, its not as forgiving as any other cutting tool.
Good luck on the build mate, you're gonna have tons of fun building it.. post pictures and ask questions when in doubt, the people here at FISD have helped me so much, and will be more than happy to help you. ill be looking forward to your build