I just imported several of the DSL arenas (Spinner, Drum, Lava) on my Starcore RA2 version, copying all of the python and bindings files (excepted the ones for other arenas) and the folders for the three arenas.
The Spinner arena and DoD arena work fine, but NOT the Lava Arena (doesn't appear on the arena selection screen).
I'm sure I put the binding and folder for it in the stock arenas folder...