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Is 2320AD planned as a standalone ruleset product, or will I need to get other rules ie DnD, or T20 to be able to run the game. Sorry if this question has been raised elsewhere.
2320 is a sourcebook for T20, not a stand-alone ruleset. It is based on the upcoming Traveller D20 Guidebook (or Player's Handbook, if you prefer) which does not require a D20 Core book.

So you need 2320 and the Guidebook, or 2320, the current Traveller's Handbook, and a D20 Core book.

The free D20 SRD contains most of what is needed, though.

2320AD writer