I suggest: a-- Pronoun ('more [things]') + prepositional phrase as noun complement. The whole unit is part of compound object of 'need'. b-- Yes, 2nd DO, I guess (I don't know what happened to the conjunction, though).
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Mister Micawbera-- Pronoun ('more [things]') + prepositional phrase as noun complement. The whole unit is part of compound object of 'need'.