costs per sign, page-10

Cant agree with your figures Mello, way too conservative .

To have 2 men at 75k each is way over the top.. unless the sign is being built by the same mob who designed the collins class submarine.

I would expect very limited maintenance on this sort of gear.
Ditto for the maintenance replacements.

I would therefore expect a much higher profitability than that.

Multiple contracts for signs does not necessarily have an equal multiplier effect on office staff and overheads. An 10 fold increase of signs would not translate into 10 times staffing and operating overheads.