Yeah, the stairs block the Charging Larry , keeping it out from under the Bunker. (Actually, Walthers blocked the Larry on their own . If built as intended, the Larry will not fit under the Bunker; I had to raise it about a ½" .) So, I needed to raise the walkway several scale feet above the pipe. As you can see, the walkway is long, going nearly the whole length of the ovens. Fortunately, there were four evenly-spaced places where support columns could be located.
These are the main pieces for the support columns. The uprights are H-beams, and are cut longer than neccessary. The other two pieces are I-beams that fit in the web of the H-beam. The block keep everything square through assembly.
This jig locates the center-point for the drill, so all the columns will be evenly spaced from the edge.
Once the tubes were in, it was time to determine where to locate the square stop to give the walkway the proper height. An alligator clip is helpful during this step. (Yeah, you caught me. This shot was taken before the shims were applied. Actually it was this step that made it evident that shims were needed.)
The placement of the columns.
With the walkway attached.
End Side One. Please turn over and play Side Two.