I get this stuff all the time, and with some my suggestions work, with others they dont want to spend a lot so I make it for them and warn them and move on.
Heck I have a good customer right now who wants a 4 x 10
sign for a facility with 8 of their company names on it. I suggested alumapanel and they balked at the cost so they said we want something temporary until we decide what we really want.
I am putting it on 1/2" coro with no lam.
Sometimes it is better to just do what they want and move on.
I warned them and told them since I do a lot of vehicles and other signage for them by no means will I be held accountable for any part of the final job.
I think within a year or so they will put aup a lit directory board.