I'm about to rebuild my CPR Standard No. 2c station in styrene (HO scale). I have the actual plans for this station type and it has many windows, in the following sizes: 20x24; 30x24; 20x48; 30x48. I'd very strongly prefer to use premade windows, like the ones from Grandt Line or Tichy. But they don't seem to have any of these sizes. Can anyone help me find a source for windows of this size? Failing that ( ), any suggestions for scratchbuilding these without going blind or slitting my wrists in frustration?