In this step you will cut apart the donor bike frame to remove the front fork/headpiece assembly and the rear triangle. Keep the handle bars unless you plan on making your own.
For cutting we suggest a Sawzall with blades meant for cutting metal. This makes it extremely easy. It is also important to secure the bike to something. We clamped the bike to a large metal table. C-clamps work great for this purpose, but there will be a lot of tension so be careful when placing and removing the clamps.
See illustration for cutting directions