I think you're seeking the equivalent of the holy grail.
Most of the people on this forum are a lot smarter than I am, so hopefully someone will post ideas because I'm looking for the same thing. Where I have come up with different ways to make the slides I haven't been able to come up with satisfactory - to me - weather seals.
One of the better prospects that I've seen is the Expandavan method that mezmo mentioned in this thread (toward the bottom):
http://www.tnttt.com/viewtopic.php?p=944551#p944551