You should contact any of the companies who make trade show exhibits. They do oversize stuff all the time and if they don't have the equipment in house, they would know who does.
Seriously, something this size isn't for the average person to handle. Let the pros do it.
I have been a professional printer and frame for almost 10 years. I have printed many big stuff and framed a lot of super big artwork (mostly canvas and paper work). For the print, I have never mounted something bigger than 1.5m wide, the length will be depends on my substract size, which is 3m max.
I am not trying to mount something over 1.5m wide nor a client is asking me.
My question is just based on my curiosity.
I know there was a company call Color Services in Boston, which has closed their shop due to the owner was too old. But they are the first company who mounted a photograph on Aluminium. And I know they used to do super size print for a lot of fine art museum.
72" lightjet is not common for photographer anymore but I just wanna know if someone knows how to mount something in that size and how would they do it.
Again, just based on my curiosity. Don't you guys wanna know too?
Aaron