Mike, I know you do not like to tell people what to do. However, would it be easier for the OP to just use one image/text and use Qimage placement functions?
That's the way I would do it but I presume in a case like this, the OP has been making post cards that way in PS for a while and might be using editing and design features (for both the pictures and the text) that are specific to PS. As long as you're not doing more complex editing like 3 dimensional text, special PS graphics overlays, etc. it can certainly all be done in just Qimage.
Regards,
Mike