This is my second generation Small part plasma cutting fixture.
Attachment 422480

The heart of the fixture is the support bracket. Here is a little video I made making one of the brackets and testing the fixture.
https://youtu.be/Qb1a3cxCT9w

The fixture supports both flat stock and angle as shown here.
Attachment 422482
Attachment 422484

The full write up can be found here.
Make a Simple Plasma Fixture — Kronos Robotics