If you end up doing a software RAID, it turns out RAID0 is really simple to set up on Btrfs. It came up in another thread here in the forum not too long ago:
I think you may be over-complicating the setup a little bit; setting up RAID on Btrfs is more simple than all of that, especially RAID0.
You can leave the installer out of it altogether--don't worry about the disks at that stage, just pretend they aren't even there.
Once you get the installation up, you can simultaneously format the drives as Btrfs and also identify them as RAID devices with mkfs.btrfs. See here: Using Btrfs with Multiple Devices - btrfs Wiki
# Stripe the data without mirrori…
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