(which includes a few links to 3D models I made of some of my tools)
and in addition to the link @theworkshope posted also see:
There was a very clever technique posted a while back on some forum where tools were placed on a glass and projected and the projection traced.
I’ve found that using a guide for a pen refill helps a lot with the tracing of outlines:
A way to avoid the need for tracing is to place the tools on a surface (assuming that they are heat-resistant), cover them with a flexible cloth such as a T-shirt, then surround it with the box you wish to use, and squirt an expanding insulation foam in.