I wish I could post links, there are a few S2 8.0's out there on some of the used sailboat sites that advertise as "shoal draft 2.5 ft, w/ centerboard down 6.1 ft" or something along those
lines.
I made a post with some pictures at this website, let me see if I can get around this no-link thing...
h tee tee pee ://forumserver.twoplustwo.com/showthread.php?p=3975176#post3975176
*here is an ad with a boat that has a shoal keel with centerboard
h tee tee pee :// 3xdouble u .sailboatlistings.com/view/8829
but again, with that i imagine it wouldn't be too hard to find the "winch" to raise/lower the centerboard, and I can't find one.