Exhibit Design Help?

We're getting ready to design the graphics for a portable exhibit, which is approximately 90" high x 120" wide, and is basically (4) magnetic panels that are each approximately 90" high x 30" wide. Since our design will contain a mix of photos and vector based artwork our preference is to use InDesign to create the artwork. However, not having done many exhibits I want to make sure we're setting this up properly.

Our plan is to design everything to size in InDesign CC 2017. Any photos used in the design will be resized with Photoshop CC 2017 and On1's Resize plugin, which simply uses a proprietary algorithm to upscale the images to reduce pixelation. We'll then place any logos and or vector based art and save the file as a printable PDF, although I'm unsure of which PDF format to provide my printer.

I just called my client's exhibit company, which is really a large advertising specialty company, and the art department said they run everything though Corel Draw. That makes me a little nervous, but I read it's the norm for much of the industry. I just want to make sure our workflow makes sense and that we're doing everything we can to ensure the best possible results. Any help and/or advice, especially from seasoned exhibit designers, is very much appreciated.

Thanks!