What's the best way to scale something 1:1 in Illustrator?
I'm relatively new to using Adobe Illustrator, and I was tasked with scaling a new sign for one of our clients using a mockup created in Photoshop to be sent to a printer. The sign itself is being redesigned to reflect our client's name change, and actually uses cut-out letters made out of steel. Therefore the scaling needs to be 100% correct in order for us to create new letters for use with the existing ones.
In regards to that, I made some measurements of the previous sign's letters and made a mockup of the new sign. I based my measurements off the previous sign and marked them on the image, but upon sending it to the signmaker they were worried the sizing wasn't right for the existing letters. Clearly I missed something with the scaling, and I'm a little lost on what I'm supposed to do to make it right. I'm trying to get this 1:1 so that we don't end up making expensive mistakes that can't be undone after the sign is physically created.

