Living in a small space doesn't mean you have to deprive yourself of BBQ options. Instructables user bajablue converted an old toolbox into a portable grill that moves easily from parks to patios.
You'll require more than just the toolbox to make this happen: some steel grates and assorted washers and bolts are needed, along with a certain amount of DIY skill. The end result is awesome -- a well-sized, portable, reusable BBQ that can be tossed in the boot and used just about anywhere. Check out the link below for a full step-by-step walkthrough, including the materials you'll need if you want to make one of your own.
DIY Portable Tool Box Grill [Instructables]