... of time. Regarding the gantry support frame, the images need to be 'butted' closely together to get the required length. There is an alignment line on the left of all images, except the non ladder end section, which should be added last of all. It is recommended, that the ladder end section be located first, them build the length by adding long, and if necessary, short middle sections, until the track span is accomplished, then finally add the other non ladder end section to complete. The 'butting' alignment is achieved by overlapping the single line of the edge of the wooden tread boards for each section. Should the need arise to clarify this, I will, if required produce a sketch to show how this should be done, though I doubt it will be necessary. It is also important, that sections be 'butted' together in the correct horizontal orientation (do not flip horizontally an individual section), otherwise discontinuity will become very noticeable. What that means is, that you may note in the images, ...