Summer quilt materials

I have been thinking of making a summer quilt out of silk and 2.5oz XP. Its super light and cheap. I can make like 3 silk shells for every 1 momentum shell. I was thinking of pairing this up with a silnylon bivy.

Or

just making the quilt from silnylon and sleeping in a silk sleep sack (which I would probably do in the silk quilt too). I am concerned with rain when I use my poncho tarp as shelter.

those of you who are using nonbreathable materials for quilts… how is it?

Looking for guidance,

Thanks!