Simple concave box and ball for GMod

Hi, i’m requesting a simple box and a sphere with as low details as possible for game Garrys Mod (spawn ready)

Box: A box with size 10m x 10m x 10m (In game meters, should not be exact but ~10 meters), as thin as possible and with concave physics, with template texture.
Ball: Diameter 10 meters, as thin as possible. Concave physics. With template texture.

All i want is a big box and ball in witch you can walk from inside.

Thanks a lot. I am making an addon (currently a secret) and these models are required.
Thank you.