Size matters, in this case the bigger the better. Large heaps or bins heat up faster, commercial scale operations use big windrows and mix them regularly with JCB's for fastest compost making. I wouldn't worry about ventilation, just emulate the big boys and turn regularly.
For smaller bins insulation would help build up higher temperatures, look at designs like Hotbin for ideas. Solid wooden walls would be better than slats for heat retention.
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For smaller bins insulation would help build up higher temperatures, look at designs like Hotbin for ideas. Solid wooden walls would be better than slats for heat retention.