I got 8 old double hung windows in great condition and I would llike to install them in my new workshop. It is made from Structural Insulated Panels ( OSB & Foam ), you can cut windows and doors out as you need them. I got some new aluminium windows that have an installation fin that can double as a moisture diversion. but the older frames fit the wall exactly ( 4 1/2 inches thick ), with no "fin" to give me a reveal. If I place the old frames flush with the outside, how do you "flash" them to keep water out. I will place stucco or hardi plank on the outside after the windows are in. Thanks in advance, Neville