Unlike my previous experiment with building NAStie installing this variant of linux onto LVM-only partitions proved difficult. My attempts left my sleep schedule a bit tweaked, and my disgust for "automated" configuration-file-building-scripts found new purpose. That aside, what worked when I installed Arch linux on LVM partitions is below.
Install Arch using the standard install tool.
While doing this, refer to the Arch Wiki page on LVM and follow its instructions until it talks about changing the grub configuration file.
(VolumeGroupLabel-LogicalVolumeLabel)to GRUB_DEVICE in
/etc/default/grubwill cause the
/boot/grub/grub.cfg-building script to insert the parameter 'root=(VolumeGroupLabel-LogicalVolumeLabel)' when building the kernel's command-line. This does not work. Once the
/boot/grub/grub.cfgfile is build by grub-mkconfig, edit the /boot/grub/grub.cfg file to change the kernel's root parameter to 'root=/dev/mapper/VolumeGroupLabel-LogicalVolumeLabel' (gathered from various sources including the LVM section on the Arch Wiki GRUB2 page).
Boot happily ever after.
This is quick and dirty, but I wanted it documented for the next time I try this.