Don't know how big your workshop is artie but mine is 28' x 9' & a couple of years ago I took out all my ducting both 100mm & 60mm as I found it more hassle than it was worth.
I just have one long flexible 100mm hose that reaches every machine now the beauty of which is if it isn't attached it can't be sucking, sounds daft but with the ducted blast gate system I lost count of the times I forgot to open & close the right gates only realising when the shop was full of dust.
It also means as my needs change in the workshop I'm not fixed to one layout, this shop is ten years old & still evolving, having a fixed ducting I found just too restrictive in what is quite a small workshop.
Just my tenpennth