Glass and Mirrors - Glass block window

I built a block window to go into my stairwell, to let in some light from the room below. It is 24"X72", and the top of it is nearly flush with the ceiling of the room below, which is a small basement kitchen. I built it in a 1x frame and then set it into the stud frame in the wall. Problem is, the window is 4" wide, and the finished wall is 4.5". This may sound a little ridiculous, but I am having some difficulties figuring out how to trim out this window. If I center it in the wall there is about 1/4" inset on both sides, so standard casing isn't feasible...without shimming, which I'm not sure how well that would look.

Anybody have any ideas on how this is usually done?

Thanks...Randy

Keep the outside of the jamb flush with the sheathing and add a 1/2" extension jamb onto the interior side of the window jamb. Usually you make the extension jamb 3/8" bigger than the original jamb so as to leave a 3/16" reveal around the perimeter of the original jamb instead of lining it up exactly flush. When the casing goes on, you mimic that reveal again to give it a stepped look.

Parting stop is 1/2 x 3/4" and would work well if you have to purchase something, but I'm guessing that you have a table saw and can rip something down to 1/2" yourself?

Sorry for not getting back sooner on this. Been really busy, but I did read and take your advice. I pushed the unit to one side to make it flush and I will install an extension on the other side to accomplish the same effect. Good advice, and I guess about the only thing that can be done. Only problem is
the extension piece will have to be tapered some bit as the wall on that side is not true to everything else...never fails...always seem to run into this kind of thing when doing remodels.

By the way, yes I do own a table saw, so ripping the stock won't be a problem. Wouldn't be without one. :)

Muchos gracious, XSleeper.