Ron,
Glad you got your block going. I haven't had much success using the Parameter Sets. Seems easy enough just to drag a parameter and action from the palette. Lately, I don't use the palette at all, just use the block editor toolbar.
Will,
I read the thread you posted a link too, and downloaded your locker drawing. I have an idea how to get the number of lockers, but can't play with that right now. Got to go to work. I'll post back later today (hopefully). BTW, how'd you attach your drawing to your post? I don't know how to do that.
-Steve