How to unpack zeroshell.img and install?

[turtle]

Greetings I am interested in trying Zeroshell however I have a box already running Linux with grub1, no usb boot in bios and no cdrom.
I tried to use dd to put zeroshell on a logical partition and point grub to it but that did not work.
Then I realized you probably have it partitioned already so unzipping the file and looking at it with fdisk I see there a are 4 partitions:

Disk /root/zeroshell/ZeroShell-3.0.0-Disk-2GB.img: 2017 MB, 2017419264 bytes, 3940272 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0xcf5090fb



Device Boot      Start         End      Blocks   Id  System

/root/zeroshell/ZeroShell-3.0.0-Disk-2GB.img1            2048      432127      215040   83  Linux

/root/zeroshell/ZeroShell-3.0.0-Disk-2GB.img2          432128     1087487      327680   83  Linux

/root/zeroshell/ZeroShell-3.0.0-Disk-2GB.img3         1087488     1742847      327680   83  Linux

/root/zeroshell/ZeroShell-3.0.0-Disk-2GB.img4         1742848     3940271     1098712    5  Extended

/root/zeroshell/ZeroShell-3.0.0-Disk-2GB.img5         1744896     3842047     1048576   83  Linux

Can I mount these from the img file to check them out? Is there any info/docs on what these are for or how to custom dual boot *nix?
I would like to use the existing boot loader on the hdd and point it to a zero shell root partition, if thats possible.
thanks
turtle

EDIT tuesday June 10th.
Note to others following this path
You can mount the iso on say /mnt/zer:

mount -o loop ZeroShell-3.0.0.iso /mnt/zer/

And look in

ls isolinux/

for the kernel info.

Then in grub2 on your HDD:

menuentry "ZeroShell (isoloop)" {

set root=(hd1,1)

search --fs-uuid --set=root your-uuid-ofhdd-here

loopback loop /ZeroShell-3.0.0.iso

linux (loop)/isolinux/vmlinuz isoloop=ZeroShell-3.0.0.iso root=?

initrd (loop)/isolinux/initrd.img

}

Assuming you can drop ZeroShell-3.0.0.iso at / on disk2 partition1
EDIT 2 June 10th 14:10
OK but what is the root device?
I can get it to boot using my /dev/sda1 root device but that boots the OS on /dev/sda1

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