Came across this picture (not sure where it came from) but this sounds very intriguing to me...
This would certainly maximize the space in your tipi without adding much weight.
Initial thoughts:
I guess you would have to add cord at the grommets instead of stakes? Maybe rocks along bottom edge to keep from flapping?
Could add enough material to make walls AND a 'sod cloth' kinda deal. Pole would need to be longer. Wonder how the liner would act?
Wish it would stop raining so I could play with the tipi and experiment.
Thoughts? Anyone ever try this?

This would certainly maximize the space in your tipi without adding much weight.
Initial thoughts:
I guess you would have to add cord at the grommets instead of stakes? Maybe rocks along bottom edge to keep from flapping?
Could add enough material to make walls AND a 'sod cloth' kinda deal. Pole would need to be longer. Wonder how the liner would act?
Wish it would stop raining so I could play with the tipi and experiment.
Thoughts? Anyone ever try this?
