How To Merge Report Output Into Single File?

Hi

I have read a few other posts about how to merge multiple report output files into a single document e.g. a single pdf.
There are a few approaches:
1) Generate post script files and then merge and oprint via a post script driver.
2) Generate seperate pdf files and then merge them into single document using a custom library.

I have a third idea and would appreciate any input:

Dynamically generate a RDL file that contains sub-reports, one for each report required in the final document, publish and run this as the final report. This could happen way before actually running the report i.e. the user has a tool where they select reports for a pack, tool then generates new RDL file and publishes it to sql reporting services, gets run at some later point in time.

Some challenges:
-Generate a table of contents with page numbering?
-Layout of sub-reports, not sure how they would be rendered across multiple pages?
-Managing parametes across sub-reports at run time.

Any suggestions or ideas?

Thanks

T