Step 1: What I used
Jigsaw-make sure its a very robust jig saw that can handle cutting metal.
A round object to trace around- I used an old funnel
Trusty old brace-this thing never needs new batteries
1/8" twist bit
safety glasses- most important tool I use.
Metal cutting jigsaw blades- I used some from Bosch that I highly recommend
paint marker- these are much better then soap stone for marking steel as the paint doesnt wipe off.
scrap steel- this is 3/16 hot rolled plate, I think