Start by forgetting anything you know about scaffolding , then start using words like ,
" assuming " Find out how much gear your potential customers have in their yards as your design will need to try and use all of it on one job.
Dont ever ask the scaffolders for their in-put as they know nothing about it.
Try and find the latest biggest beams on the market and insist they use them , even if they dont have them , but have tonnes of other beams.
If you get into trouble with a designs calculations just throw loads of 21 foot ladder beams into it until the calculations work , they aint that heavy anyway.