Prequilting SynthIsolation for removable layers TO WHAT

[utilisateur]

I'm thinkering around with the idea of an adjustable synthetic quilt(layers exchangeable OTG).
To avoid cold spots i'm planing to overlay at least two layers with the staystitch(right word?)shifted
and the layers only attached to eachother on the boarder.

Well it just occured to me that it is not as simple as i imagined as i need something else to quilt the Primaloft to.

I imagine someone here must already have done something similar ?

I know of Vlieseline and such but i dont know what weight is available i think someting around 0.5oz would be ideal?
What should i be looking at?
What material is there and would you use a continuous layer or cut out alot of windows so the additional material is only running along the stay stitch?

And if someone here knows the Primaloft, would the scrim that it comes attached to be sufficient on one side?