R – Landscaping in Rave Reports using Delphi 7

Have a look at the documentation "Rave Reports" [PDF]

First, by default, the printer settings are used.

Second, you can try to set the SystemPrinter.Orientation property to poLandScape

Also have a look at Anchors:

Anchors can be used to create adaptable Reports when combined with other Reporting features. Imagine that a Report needs to be defined that can be printed in either landscape or portrait orientation or that the Report may be run on different size papers. Setting the Anchors properly will allow one Report to adjust to these changing conditions.

While I don't have any real experience with Rave reports, I also had to perform stitching of multiple "pdf" pages to a single pdf document. I ended up using Gnostice PDFToolkit to do the final merge and it works quite well. In my case I was generating multi-thousand page documents, so i'm sure it will fit your needs.