Since it doesn't seem to have been documented anywhere else and the electrical engineering forum was the /closest/ thing to an on topic place I could find I'm posting this here (esp since you will likely want to use this while wiring things up)
Using a mod I found the recipe for scaffolding:
Scaffolding behaves similarly to four ladders siding a plank box top; yet only takes up one block (as ladders do) instead of 5 as the ladder on plan equivalent would be; it's extremely cost effective; in the face of jet packs and it's limitations of use this seems like a fair balance to me and lets those planks go to treetaps.
Warning: the grab edge is /razor/ thin; you will want to shift to the limit of the edge, facing the platform, if your boots won't stop your fall.
Scaffolding requires a block beneath it to be placed and appears to break similar to reeds; I have yet to find an upper stack limit.
There appears to be a bug where it's possible to place a scaffold block on top of another as it is being destroyed; subsequent blocks of scaffolding cannot be placed on top.