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@OP - That's great that you have almost completed the project!  I bet you are glad it's over and  I hope you are getting paid well for your work on it, especially considering what the sponsors of this work are likely going to have to pay to have a banner that is 30 feet by 7.5 feet printed.  Yikes.  I would love to see it (at low resolution, LOL) when it's done.

Also, in case you aren't aware of this, Adobe has gone over to a subscription payment model to access their programs. If something like this ever comes up again, renting AI for a month would have only cost $30 USD - just pass it on to your customers:

https://creative.adobe.com/plans?sdid=KKQWP&kw=semoverview&skwcid=AL!3085!3!60310494280!e!!g!!adobe creative cloud&ef_id=VAE3xAAABRJvjayW:20141116190006:s

 @Larry (ALB) - That was a great post and very good reasons you gave to continue to try to help the OP with the PS approach.  I was taking a larger view of the problem, both for the OP's sake, and for future readers of this thread, explaining an approach in which the total file size would likely not have been more than several times the size of a single photo of reasonable quality, ie, several pix embedded into an AI, InDesign, or similar file - tens or low hundreds of MB, not many GB.

Cheers,

Tom M

PS -  I see that I was writing about the CC subscription model at the same time as you were, Larry.  Tnx.