I'd call that assumption about logistical over-head highly optimistic. Besides all the manual labor still needed before the mounting structure can go up, you still need to set up your "mobile factory". And if that factory isn't working you still incur the fixed costs of said factory. And as things stand, the most robust, flexible and climate tolerant robot to date is still a human. Especially if sad human labor tends to be comparatively cheap.
EDIT: Autonomous forklifts are old tech by now, most container ports are close to be fully automated as are tons of factories all over the world. Heck, we even have automated lawn mowers and hoovers...
I was making a much narrower point above, just that there isn't additional overhead involved in shutting down for a day with our system, as opposed to sending hundreds of workers home which does happen today. Absolutely as you mentioned there's overhead in general involved with delivery, setup, teardown, and supervision.
And yes, as you said there is still the lost time value of money associated with any equipment that's not doing productive work.
EDIT: Autonomous forklifts are old tech by now, most container ports are close to be fully automated as are tons of factories all over the world. Heck, we even have automated lawn mowers and hoovers...