I will be making something like that (vertical anchor storage) on my 23CC. Its something I have left to the end to figure out, but there its going to be a pretty tight fit vertically. I will probably have to hang the anchor on "hooks" up forward of the hole i have cut, so that there is enough room for the anchor to hang without hitting the bottom of the well.
this is what my anchor compartment looks like...
http://gallery.bateau2.com/albums/us...ne_307%7E0.jpg.
I did take measurement of a traditional vertical anchor storage set up, and there was just no way it was going to work on my SC, the space just is not deep enough (unless you use a short anchor)