Sorry, I can't paste your pic URLs, and I'm not typing them out! :-/.
However, you are in luck. It's running a more-or-less standard version of Redboot so it probably knows how to boot a 2.6 linux kernel. Next you need to make up a serial cable and then break into the boot with CTRL-C. It will be running a boot script immediately after boot which will contain the offsets of the kernel and rootfs, but I'm not sure if you can find out what it is from the prompt because it's usually compiled into redboot. You need to find these offsets. Once you know those you can make your own firmware by flashing into the same area (but be careful since I'm not sure if redboot will prevent itself from being overwritten). Redboot will be at the top of memory, it's usually 132KB long, so it will likely be starting at 0xfffe0000
Most versions of redboot contain commands for dumping memory areas. On a 4MB device flash will start at address 0xffc00000. By dumping memory at various offsets you should be able to figure out where the rootfs and kernel start, then it should be a simple matter of reflashing with your own data.
I forget the specifics of the redboot commands, but there is a help function (type 'help'), so long as it's been compiled in, of course!
You could make life a lot easier for yourself if you simply use a USB root system with this device. You can then follow very similar instructions to these:
http://bifferos.bizhat.com/kernel/
http://bifferos.bizhat.com/rootfs/
This way you don't need a new OpenWrt profile but can just use the existing AMIT tgz.
Hope this helps,
biff.