aluminum stock

[dirt101]

Where is everybody getting their aluminum plates to build custom parts? I am looking to build my rustler up here soon, and I would like to build a custom chasis, and flip the tranny around. I was thinking either 3mm or 4mm thick but I am not sure. I'm planning on using a 60mm medusa on 4s so it will be fairly heavy, so im leaning toward a 4mm plate.

tell me what you guys think.