If you have access to a rapid-prototype machine the attached shell.stl file will let you build one of these 2.5" drive forms.

Attach the Addonics CF adaptor shown and this will fit your CF card neatly where ever a drive would have gone.

http://www.openrp.com/ << a viewer for STL files.

Thats pretty neat. Useful for lots of other things as well.

PS> I did have to sand down the top of the led as it stuck out the bottom too far.