In the interest of getting the “most bang for my buck,” I have been trying to find “standard window sizes,” as opposed to what is generally advertised as “custom” windows… Perhaps this is something that is available in high performance windows, perhaps at widths which correspond to common framing widths such as 24″ OC, 16″ OC, etc. I would be happy to design around these parameters, but it seems that most high performance window manufacturers also tout “custom sizes.” Does anyone have a lead on standard high performance window sizing?