Can be built about 6 foot tall and about 7 foot in diameter
cardboard is free,need to buy staples,boxing tape for joints,plastic bucket for top ring,and some rope ,and make a door ,window,and such.
Might need a few 2x2s for wall support.

If the cardboard was bought and cut long ways I see no reason the yurt couldn't be built at 12 to 14' diameter.

To expand on this idea---by adding a wall structure between several dellings.Creating a family unit which adds securety in numbers