It's a neat idea, but I wonder how practical this is from a build/serviceability perspective. They say they are only "minor alterations" from standard designs, but each one of the towers looks unique (I'd guess they have 6 or 8 total "poses"). But I'd also think there is a lot of value when all the towers have the same design in terms of service and maintenance. These must undergo regular inspections to ensure that no load-bearing components have been compromised.
If you follow a long transmission line you will see several pylon designs depending on terrain, river crossings, highways, and the like. Pylon design is a well understood engineering problem with lots of software to over-engineer the designs. And yes they will need a reasonable inspection schedule as do all transmission lines.
All the components, e.g. struts and joints, can be interchangeable, just arranged differently in each one. You would never need to keep complete pylons in stock for each design.
Sorry, I wasn't commenting about the inventory, I was thinking more along the the lines of creating simple maintenance plans for each arrangement. Keep in mind that the average utility field service worker is often kept most efficient by minimizing the number of variations of any given task.
