Here is an update on parts.

This is a picture of the "lid" of the Nintendo case, viewed from the inside.
As you can see I got two strips of industrial strength Velcro (TM) lol, at the fabric store.
The small red circles show where I used a Sharpie marker to mark
the edges of the CD-ROM while in place where I wanted it.

This is a shot of the CD-ROM with Velcro already attached to the top.
Ordered Laptop to IDE adapter on Ebay for $3.

The red circles mark the moint-points in which the screws will hold the motherboard in place.
The back side of the Nintendo case is not a perfect 90 degree angle, so I had to use two
different sizes of standoffs, to make the board 'lean' a little lower in the back to
compensate for the angle. I used 60 minute Epoxy, although 5 minute or 60 second Epoxy
would likely work just as well. Either way it takes 24 hours to cure fully.
The inset is a closer look at both standoffs, I wanted to use all 4 metal ones, but the backs
were just a little too tall. I improvised with pieces of plastic I had previously removed from
the case as filler, first a layer of Epoxy on the base, then stuck one piece, then more Epoxy
and so on, until it was the right height.
The trick to getting everything perfectly lined up so the screws will go in? Easy! Put your
Epoxy on the base, put the screws through the motherboard, into the standoffs, THEN put
the whole thing on top of the Epoxy-ed base. Let sit undisturbed.

A shot from behind with "lid off and CD-ROM installed, note how the velcro will keep it above
the computer when fully assembled. Red circle is where the power brick plugs in to the case.

Here is my baby booting up!
I have the Hard Drive on the outside for two very good reasons... 1) It keeps the heat from
building up inside the case which only has one 40mm fan on the processor, 2) It is too big to fit inside.
I am experimenting with a CompactFlash card to run Linux and am having moderate success.