when you have a F that is too big to fit into a terrain feature, do you move through it like it was difficult terrain? if so does having pathfinders master help?

You may move through defendable terrain but it counts as difficult terrain and pathfinder don't work cause pathfinder works for difficult terrain but this only count as difficult terrain it is not difficult terrain.

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"There are only 4 things you need in life: Lasagna, beer, a girlfriend and of course a gondor army."

Quick answer , yes. Not sure what Hero of Gondor is on about though :/ Its all at the end of page 55.

The quick answer yes is for his first question. Yes you can move through defendable terrain but it counts as difficult terrain.
His second question was if pathfinder( master) works for moving through defendable terrain: No you can't use pathfinder( master) because you are not moving through difficult terrain but through defendable terrain. Defendable terrain only counts as difficult terrain it isn't difficult terrain.

Hope this is a little clearer

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"There are only 4 things you need in life: Lasagna, beer, a girlfriend and of course a gondor army."