[Shop-talk] Filling large gaps in wood?

[bjshov8 at tx.rr.com]

I stand by my first answer- tapered strips of wood to go between the ends of the plywood box and the back face of the molding.  You could rip them real fast with a table saw.

 
> THat's great to know, I will likely go with that. Thanks!
> 
> As for the rest of the responses, clearly I did a horrible job of explaining
> the issue :-)
> 
> Here's someone else's basement and what I'm trying to accomplish on a 100 year
> old house:
> http://s110.photobucket.com/albums/n115/rabbit_016/?action=view&current=IMG_0
> 626.jpg
> 
> In more detail, the basement wall is cinder block, and the windows are
> recessed against the outside. I framed the basement walls with sleepers,
> including framing around the window recesses. Then I built plywood boxes that
> slid into that window framing. Due to the wavy nature of the wall, the boxes
> would rarely sit flush against both the window and the wall framing. When I
> had to choose, I chose having them flush against the window.
> 
> Then I sheetrocked the framing, and added 1x3 casing around the window
> openings. It's this casing that doesn't always meet the butt end of the
> plywood box. So the gap is between two wood surfaces, perpendicular to each
> other.