So I took the initiative, removed two of the windows, took all of five minutes, solid metal frame around both windows, cut 1/2 ply to closely fit into area window occupied, 3/4 by 3/4 alum angle screwed into frame so that outer skin of ply is flush, cut out new window rough opening, screwed/ glued ply to alum stock, laid combo fiberglass 2 inches outside of outer skin covering gap, very solid, watertight, will get pics tomorrow, thanks everybody
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