its been said many a time, these will not "propel" objects, so they can't be used as faith plates..Looks good to me, though as has been brought up, the shaft of the Piston could be a little thicker.. Although looking at the texture used above, the sides of the shaft use the same texture as the edges of the platform so thats probably the limiting factor there..
Well, considering my computer only lets me use vanilla MineCraft, I'm just glad to be able to make new contraptions. I tend to be a big fan of creating contraptions, and just think of everything you can do with these.
http://www.minecraftforum.net/topic/366558-slanting-fences-on-half-blocks/page__st__140__gopid__5738864#entry5738864