A reader sent a note that there's a japanese company offering a small, metal (Aluminum) iMac (233-333MHz version) conversion case. The reader email included 3 images of the exterior and interior of the replacement case from the vendor page. It doesn't hold the original CRT display but is very compact.

"I found an interesting company that makes metal case enclosures for iMacs which can be found at the following site:
http://www.pawasapo.co.jp/ac/sg/index_sg.html
Dwayne C"

A reader replied with a bablefish translation:

" Mike,
I've included the very rough babelfish translation below. (replaced by the one below-Mike) In short, the case is indeed aluminum. The cost is almost $300 USD though.
-Jarod Wilson"

Later a Japanese reader sent a better translation of the page than babelfish's:

"Hi Mike,
I'm a japanese reader of your web site. I just saw the article about the Japanese product "iMac Metal Case" and send the translation of their web site to you. Hope it would be helpful.
My translation might be so poor as well though :(
Thanks,
Anonymous
OBTW, $1 = 118.60 Japanese YEN as of today.

*****
+ iMac case?SG-41 now on sale.
+ Immediate Report +
We just completed a re-design of chassis which is enable to install "iMac 333MHz" type.
Sorry for making wait so long time.
Now, "iMac 233/266/333" are available.

Name            : Metal Gear iMac case
Part Number     : SG-41
Dimension       : W250mm x H180mm x D230mm
Material:
  Chassis       : Steel, Steel mesh
  Front Panel   : Aluminium
Finish:
  Chassis       : Black or sand silver
  Front Panel   : satin finished surface w/ Aluminium alumite
Specifications  : Assembly Kit
  (Parts which is needed like a fan, cable, or screw are included.)
  + iMac itself is not included.

Applicable Model: iMac 233/266/333MHz(Tray-loaded CD Drive Model.)
Price : 34,800YEN/kit (Web order only)

+ Notice +

• Use only for iMac 233/266/333 (Tray-loaded CD Drive Model). Any other iMacs are not available.
• The skill which is enable to disassemble or assemble iMac
  with your responsibility is needed.
• We don't reccomend this item to the person who don't have a confidence to deal it because this item is categorized "Assemble difficulity 5 (Very Difficult)".
• At the stage you disassemble iMac, the warranty from manufacturer
  is expired.
• Search by yourself at a magazine or book about the method to disassemble iMac.
• The inquiry to us about the method to disassemble or assemble iMac is not available.
• We don't accept any responsibility for an accident, breakdown, trouble and the loss of the recorded contents.

+ Immediate additional sale +

We sell "HARMONi G3?Sonnet) Accelerate card" for 34,800 YEN because of many requests.
(500MHz Power PC G3 processor + Onboard F/W port)
F/W port when puts HARMONi G3 Card is available to use.

And also, based on this, we offer some package deal.

"iMac case(SG-41)" + "HARMONi G3(Sonnet)"
69,600 YEN -> 59,800 YEN

"iMac case(SG-41)" + "F/W HD case(SG-54)" + "HARMONi G3(Sonnet)"
97,600 YEN -> 79,800 YEN

"iMac case(SG-41)" + "F/W HD case(SG-54)"
62,800 YEN -> 49,800 YEN

will be available soon.
*****"

Other iMac Case Conversions: The FAQ's iMac section here still has a link to a reader's iMac rev B to PC ATX Case conversion article from last December's news page.
Several readers also sent notes about the Marathon rack mount cases (which I think I mentioned a year or so ago, but good to include here again)

"I can't recall if you've covered this before or not, but with the mention of this aluminum cube-type case, I thought it bore repeating the cases available from Marathon Computer. 1U chassis available for both 233-333 (rev A-D) models, and DV models with slot load CD ROM drives (rev E and higher as stated on their site.)
http://www.marathoncomputer.com/irac.html
Rick"

iMac Toolbox Case Conversion: Another reader sent a link to his "toolbox" iMac case conversion:

"Regarding: Compact Metal Case Conversion for iMac 233-333MHz
Check out: http://home.attbi.com/~vrot01/Princess_Toolbox.html
A considerably cheaper metal case conversion I did a few months ago.
Best Regards,
TV"