Another method for the windows is the "snap & glue" method. Here you slice and dice the wall up cutting the window openings out in straight line. You discard the "windows" and glue the rest back together with solvent cement. Some folks use thin styrene as a backing sheet. Glue the wall pieces to in then knock out the window openings again. I didn't choose this method when building my station project, but wish I had since it makes a much stronger assembly. It gives you dead square window opening corners without having to do a lot of hand finishing.
Here's all the pieces scored and broken apart. Place X's on the pieces representing the window areas so you don't accidentally discard parts of the wall. This station is a complex assortment of horizontally and vertically oriented siding panels which made this step more challenging.
This picture shows the vertical and horizontal patterns. The batten boards cover up any glue joints when putting the wall back together, but with judicious use of solvent and good alignment the joints are almost invisible.
I've been working on and off on this project for over 6 years, but am really getting near the end. You can follow it on my other thread, "Continuing Saga of the P&PRR"