Was this ever a thing?

Was there ever a map in Forge World that combined Hemmorage, Paradiso, The Cage, Asylum, and Pinnacle into one supermap? If so, a link to download would be greatly appreciated.

Yes, it was called Forge World.

In all honesty, all of the maps you mentioned are all created on separate parts of Forge World, so making them into one big supermap is pretty pointless.