Cricket Signage Artwork Resize

I’m updating sponsor signage for our cricket ground and have the design as a high-resolution image. It now has to print at 900 mm × 2400 mm while strictly maintaining its aspect ratio—no stretching, cropping or colour changes.

You’ll receive the original file right away. What I need back is:
• A print-ready PDF in CMYK at 300 dpi (or the printer’s preferred spec)
• The editable working file (Photoshop or Illustrator)
• A quick proof that clearly shows the final dimensions

If you regularly prepare large-format artwork and can keep every pixel sharp at this size, I’d love to hand this over to you for a fast turnaround.