Brick Mold Installation on Replacement Window

My back brick veneer wall got blown out by Hurricane Katrina (windows, too)--7 feet of water in house. Finally, we recently resurrected the brick wall, but before the windows were put in. We left extra space around the windows utilizing temporary brickmold so the brick masons had a place to stop. Now we finally have our replacement Pella Impervia double-hung windows installed in the framed out openings, but have too big a gap on the sides of the windows (bigger than a regular piece of brickmold). Our plan is to enclose the gap with brickmold and then line the "brick window jamb" with Harditrim boards (to fill the rest of the gap--3/4"), create a window sill with Harditrim board, and then put 6" trim on the outside of the brick wall. We are trying to fill the gap as well as make the windows look like they have wood jambs and trim (no exposed brick in the jamb). There is no overhanging brick sill.
Anyway, my question is:
Is brickmold supposed to be (1) butted up flush to the window frame itself with caulking between and then butted up to the window jamb (with caulking), or (2) put overlapping slightly on top of the window frame edge and then butted up to the jamb?
The Harditrim board we are putting on the window jamb is a concrete product, and the brickmold is Solid PVC brick mold (not wood), so we should not have any wood on brick rot problems in the future.
I done an extensive web search, but no where does it show a good picture or description of how to install brickmolding around a window. It always just says install brickmolding (or brick mold/mould).
So in other words, is the brick molding installed "on" the Pella window frame or next to the window frame.
Hope someone can either give me an answer or direct me to a decent site that shows the layout. I need to solve this so I can install my hurricane shutters. It has been almost a year since my house was wiped out, it is hurricane season again, and I want to get my house as water tight as possible.
Thanks in advance, Nancie
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Nancie

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On old windows the Brickmold is applied on the window frame. The outside of the frame should be even with the outside of the sheeting. The brickmold should be fastened to the sheeting on one side and the window frame on the other. That said this should have all been done first than brick set to the brickmold. I am not familiar with any Pella windows that still use brickmold. All I have seen are clad outside with no brick mold. They are installed first and the brick is set over the flange touching the clad window frame. If I understand you correct you have set the brick without the windows in. If this is the case you may not be able to use brick mold. You may need to get some wider stock and make your own casings to fill the area between the new window and the new brick.

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Are the windows clad with aluminium or vinyl. Some manufacturers supply a filler piece that fits or snaps onto the window edge and fill in the gap to the brick or other cladding. The piece needs trimming in width to fit the gap. My aluminium clad wooden windows used this system to fill in the space. I asked and they supplied (for a price) the necessary pieces.

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