Here you can see me using my trusty Solar Powered bandsaw to cut the tubing that will form the top and bottom of the frame. The easiest way to cut two piece of steel to exactly the same length is to line them up and cut them at the same time.
Using the same method to cut the angle iron that will be the ends of the frame.
Reinforcing the center of the frame where the bearings, shocks, and counterweight attach
make sure the frame is level and square before welding it together.