Cast, well-organized, assembled quickly (6,8)

I believe the answer is:

thrown together

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'assembled quickly' is the definition.
The definition and answer can be both to do with creating things as well as being past participle verbs.
Maybe you can see a link between them that I can't see?

'cast well-organized' is the wordplay.
'cast' becomes 'thrown' (cast can mean to throw).
'well organized' becomes 'together' (I can't justify this - if you can you should believe this answer much more).
'thrown'+'together'='THROWN TOGETHER'

Can you help me to learn more?

I've seen this clue in The Times and The Sunday Times.

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