In this step we take a scrap piece of plywood 2 foot by 4 foot by 1.5 inch thick (2 sheets of 3/4in plywood that were screwed together that I used to use for a TV stand).
Fortunately the angle iron was available in 2 foot pre cut lengths, but it cuts easily with a hacksaw. A square of this angle iron was bolted together with 5/16in bolts that connect at the corners and to the base wood piece. A third vertical piece was connected to act as one bar of what will become a 4 bar mechanical linkage.
2 more 2 foot lengths were connected at an angle to stiffen the structure. They were bolted to the wood piece using short scrap lengths of angle iron as bracket.
A wider piece of angle iron was added horizontally to minimize twisting of the middle vertical piece. Twisting would become a problem later.
Two 4 foot lengths were bolted to the middle vertical piece with about 8 inch vertical separation. These will be the main lifting arms, and form 2 more links in the 4 bar linkage.
The linkage was completed by adding a vertical piece at the end of the 4 foot bar. The saucer will be attached to this piece.
For more information on the 4 bar linkage, a fundamental mechanical structure, you can read the article here http://en.wikipedia.org/wiki/Four_bar_linkage