I installed LFS6.8 as per the book on a USB stick. Everything spick and span except at the end, when GRUB refused at first to install itself claiming some area or other was too small; but since it gave me the option of installing anyway with the --force parameter (and I was so damn near the end), I went for it.
Ill-advised impatience: when trying to boot I got:
Root-NFS: no NFS server address
VFS unable to mount root fs via NFS, trying floppy
I am sure there must be an elegant way out of this ...