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Here is transport capacity of Ork battlewagon:

A Battlewagon can transport 20 Ork Infantry models. Each Mega Armour or Jump Pack model takes the space of two other models.

Word "other" really confuses me. So how much place exactly takes model with Mega Armour, two or three (one basically + two other)?

One mega arnour, takes two spaces

Two.
A model in mega armour takes the space of two other (meaning other type previously stated...infantry) models.

I am an editor, and I would have cut the word other for clarity, but I think we can safely assume a mega armor ork takes two spaces.