ubuntu or debian custom partition with raid0 and lvm

in Debian/Ubuntu server install, custom partitioner:

    delete all partitions

    for GPT disks, which for sure is any >2TiB:
        make one partition
            size: 1 MiB
            use as: reserved bios boot area (not sure on exact wording)

    make one partition
        size: 512 MB
        use as: raid

    make another partition
        size: remainder of disk (just hit enter, it's default)
        use as: raid

    at the top of the partitioner, select "configure raid"
        create a raid1 with the 2 smaller partitions (for boot... always use raid1)
        create a raid0 with the 2 larger ones (or raid1, 10, 6, or whatever you actually want for root)
        finish configuring raid

    now you see more devices to modify (raid volumes)

    Modify the smaller raid1:
        use as: ext4
        mount point: /boot

    modify the larger raid0:
        use as: physical volume for lvm

    at the top of the partitioner, select "configure logical volume manager"

        create volume
            name: swap
            size; 4GB I guess
        create volume
            name: root
            size: remainder of disk (just hit enter; it's default)

    now you see more volumes again (logical volumes)

    modify root
        use as: ext4
        mountpoint: /

    modify swap
        use as: swap area