On Sat, 18 Dec 2010 21:36:36 -0500, "RogerT"
wrote:

Thanks everyone for all of the ideas, suggestions, and feedback. I didn't
realize that replacing the entire window, frames and all, is fairly common.

Happens all the time. Say, replacing a set of casement windows with a
garden window.

pic:

http://www.metronyinsulation.com/userfiles/images/garden_window_5101rt.jpg


I also found some YouTube videos that show how its done and what would be
involved if I decide to go ahead with the "full frame window replacement"
idea.

Get the written install instructions from the window maker and be
safe.