i've gotten much closer to the solution.

turns out that"

(1) Centos' "vmlinuz" & "initrd.img" provide full & equivalent
functionality to the C5.5 netinstall ISO.  *NO* iso->cdrom mount is
required,
(2) even if it were, for PV, mounting hdc:cdrom is incorrect; that's for HVM

making changes, the following gets me to the Centos installer in a VNC
console ...

-------------------------------------------------
name         = 'centos'
builder      = 'linux'
kernel        = "/home/xen/centos55/xenboot/vmlinuz"
ramdisk       = "/home/xen/centos55/xenboot/initrd.img"
disk         = [ 'phy:/dev/VG0/vm_boot,xvda,w',
                 'phy:/dev/VG0/vm_swap,xvdb,w',
                 'phy:/dev/VG0/vm_root,xvdc,w',
               ]
vif          = [ 'mac=00:16:3E:01:06:00, bridge=brA, vifname=vif.A']
vfb          = [ 'type=vnc, vncdisplay=106, vnclisten=192.168.1.2' ]
extra        = 'textmode=0 xencons=xvc0 elevator=noop lang=en_US.UTF-8
keyboard=us timezone=America/Los_Angeles ip=192.168.1.106
netmask=255.255.255.0 gateway=192.168.1.1 dns=192.168.1.1 noipv6'
maxmem       = 1024
memory       = 1024
vcpus        = 4
cpu_cap      = 100
cpu_weight   = 256
localtime    = 0
on_shutdown  = 'destroy'
on_reboot    = 'restart'
on_crash     = 'destroy'
-------------------------------------------------

the installer queries for device (eth0), method (http), and source
url/dir (mirrors.kernel.org, centos/5.5/os/x86_64/), then begins
downloading.

when i try to get that additional info onto the "extra=" line, with any of,

        url=http://mirrors.kernel.org/centos/5.5/os/x86_64/'
        method=http://mirrors.kernel.org/centos/5.5/os/x86_64'
        device=eth0

the info's simply ignored -- no launch error -- and the installer,
again, interactively queries for the same info, then proceeds.

i've searched for hints for that Centos "extra=" line, so far to no
avail ... at least not without using an additional 'kickstart' config
file.

any idea what works?
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