Getting back to gabions and liners, here are some questions:
What is the expected life of a geotextile liner?
Would the gabion and liner stand up to the soil being compacted?
Could you use foamed loam in a lined gabion arch or dome?
What would be the best way to seal the surface of a stone filled gabion? I recognize that some would want to preserve the aesthetic of the stone face, but without grout or mortar, it makes a great hideout for vermin. I suppose you could do a kind of slipform stone masonry, using the gabion as a sacrificial form, or put a veneer over the gabion.