This is the gold standard to which you should aspire. The case was not modified at all. Perhaps this will be helpful in concealing your wires:

http://dclausen.net/projects/tfam/

Also, while I prefer the LCD, it doesn't quite fit properly in the CRT bezel opening. For any such project this is serious consideration, especially now that we have a report it can be done relatively easily:

http://www.123macmini.com/news/story/782.html

Here are some other good Mini conversions:

http://www.destruc.tv/minitosh.php

One based on a Colour Classic with good custom manufactured parts. (text only - images lost - B.)

You might also consider this conversion to go with your iPode media center on a pair of "beyond-repair" compacts:

http://www.arawak.com.au/hifiplus/hifiplus.html