[Gimp-user] How can I create huge billboard sized files in super high dpi?

["Tara Gover" <tarajenay mail com>]

Hi guys,
 
 
I am printing super high res images onto fabric.  My print guy has instructed me to create my images in 1440 dpi and my fabric is 58 inches wide and about 80 yards long.  I need to create ONE image so they can just print it continuously along the whoe piece of fabric.  So I need to create a REALLY BIG image.  They have recommended Adobe Creative Suite, but of course I want to do it with GIMP. 
 
 
Just today, I installed the latest GIMP, and it doesn't seem to be letting me create even a 58x72 inch image in 1440 dpi.  Is there an add on or a way that I can create huge tiff files in GIMP?.....or do I have to shell out the cash and get Creative Suite?
 
 
 
Thanks!
 
 
Tara