airframe tubing

Hi all, I’m working on a rocket that’s going to use an L-class motor and have gone with a phenolic tube (which will be wrapped in a fiberglass sleeve) for the airframe. I know the phenolic tube isn’t RF-transparent, but how do people using phenolic tubes usually perform any telemetry (if they...

I am wondering if there are any suppliers that offer 7 inch O.D. cardboard airframe Tube for a custom scratch build project? I know this might be an odd size, but the scale data I came up with calls for this size tubing. I have searched this forum and the web scouring for rocket suppliers but...