It's a great option.I keep looking at the xlr magnesium chassis for my build I'm starting. They are in gj which is fairly local to me. Only 3 hours away.
I have one and really like it. Not much more weight than a Manners EH1.It's a great option.
I hunted with a Grendel for a few years and it had a Lancer carbon fiber handguard for the specific reason of low thermal conduction.I have a rifle in that chassis and find it inconvenient for anything but prone shooting...but that is what I use it for.
For hunting, this season was my first one carrying a metal rifle. A 458 SOCOM AR in deer season. I found it a heck of a lot colder with a metal rifle in my hands and lap at 18F than with a traditional rifle. I WILL find a way to insulate the handguard next year or carry a different rifle when it is cold.