Yes, of course.
I am not sure from your post what size the print will be, but for the sake of discussion, I will assume 80 x 44.
Set the driver to Roll paper Banner mode.
Set user defined size to 44.02 (Max for a 44" roll)  x 80.0 long
If the print width is less than 44.0 inches, you just add  the image, and size it to whatever size or FIT TO PAGE (crop scissor on)

If the print width is actually 44.0 inches, then also click Borderless in the driver.
That makes the printable area 44.25 wide.
See screen snaps..
100 shows banner mode.
097 shows Fit to Page size in normal size (no borderless)
099 shows the change in printable area after borderless is selected.
098 Shows that Qimage is sending a 44 x 80 print to the driver.   (From Custom print size, I told Qimage I want a 44. x 80 print size)

Hope some of this helps...

Fred

Sorry, but you have not given me anything to work with.
What do you mean not printing the beginning.... It starts in the middle of the print?
How does the 100" Photo Shop Background come into the question ?
Please give specifics
Print size, Print contains 7 panels of what sizes?
Driver settings.?

Screen snapshot of the preview panel and the printable area.
Screen shots like my 098 above showing the print that Qimage is sending to the driver.
What is your User defined page size?

Anything else that might answer the question which is???

You asked if Qimage can print 44 x 80.
YES!
What is the subsequent question.?

Fred