Updating Media Hub firmware *without* an Internet connection? (+ A few other questions)

Hi everyone! :-)
I recently purchased an NMH305 in the DSG retail stock clearance, which I am planning on using as a "Black hole" for my audio, video and software collections. Before I begin setting it up though, I need to check on a few things and ask a few questions. :-)
First things first, here's a brief overview of my network and some other stuff:
My network has no connection to the Internet whatsoever. I was previously online with a major UK ISP, but because of numerous connection issues and the fact that a direct connection has negative impacts on my lifestyle, I decided to get rid of it and do without.
Consequently, all of my access to the Internet (E.G: Posting here) is done through local libraries and friends connections.
Most of my systems run Windows XP, but I also have a few Ubuntu, Fedora, and OEM firmware based clients knocking around as well. Windows VII and/or a mass switch-over to Linux may occur in the future.
All network clients are wired up with 100mbps fast ethernet (No wi-fi)
My Media Hub currently has it's 500GB WD Green Caviar installed, but my plan is to replace this with two 500GB 7200rpm Hitachi drives stripped out of USB external caddies for quicker access times, greater peace of mind (I don't really trust Western Digital products) and use the more efficient Caviar as an external HDD insted.
Because I like to keep my systems as "light" as possible; I'd like to skip using the bundled set-up CD (Which'll install a lot of stuff that I don't need) and insted set-up the Media Hub manually using a web browser or terminal connection.
I consider myself to be an experienced and advanced user, and therefore I'm comfortable with the idea of configuring and operating my Media Hub via an SSH or Telnet session.
Downloading, backing-up and restoring Firmware by hand:
Anyhow...The first question I'd like to ask is How can I backup and update the firmware on my media hub using only my local network? I know full well that I can download the firmware images using just a web browser, but I cannot seem to find a direct URL anywhere on the Linksys site. The closest lead I've got so far is http://downloads.linksysbycisco.com/downloads/firmware/NMH_FW_3_18_15_B_ReleaseNotes.txt...But no logical variations of this URL that I've tried (Drop the _ReleaseNotes.txt, try .bin .img .tar .tgz and .tar.gz extensions) have resulted in success. :-(
If anyone has the direct URLs for the firmware images, I'd be most greatful. Failing that, if anyone can tell me the URL that the Media Hub uses to perform a version check (A few packets dumped via WireShark during a check will do) I can follow the HTTP chain from there by hand. :-)
Naturally, I'm assuming that there is a means by which to dump and upload firmware to/from the Media Hub (Via an SSH session, most likely) but if not, would serving the firmware update from one of my own systems (Using a record on my local DNS) work, or does the Media Hub use a secure connection for this?
Operating the Media Hub via SSH/Telnet:
As the Media Hub runs a customised version of Linux, I presume that administration via Telnet and SSH are available. I assume that the default login would be root / admin (I'm assuming the web interface also uses the root account for it's administrative logon) but is that correct...Or would I need different credentials to those for a Telnet/SSH login?
Installing new HDDs: Anything need keeping off the old one?
Finally; As I mentioned above, I'm planning to swap the OEM drive supplied with two others before use. I'm currently leafing through the users manual and am about to come across the procedure given for drive replacement, but given the size of the Media Hub's UI - Which looks to me to be pretty heavily featured - I doubt the whole lot would fit on the Hub's firmware flash...So presumably I'd need to back-up interface data and files from the OEM disk to the new disks first.
Dumping data from one disk to another isn't a problem (dd has become one of my favourite utilities over the past year) but - Thinking from the viewpoint of efficiency - Is it possible to restore the UI data and interface alone (No media lists or cache info - That's better regenerated after) without having to dump the first x sectors from one disk to another?
Also; Given the unit comes with a 5400rpm WD Green Caviar, will the Media Hub's PSU handle two standard 3.5" HDDs (Which could draw about 15-20w each) without problems? :-)
Farewell for now, apologies for the length of this post, and many thanks in advance for any help! >:-)
+++ DieselDragon +++

Check out the posts here and another one here .
Better check with the hardware tested list below for the harddrives.
NMH Series Hardware Tested List
Cheers.

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