Sash Window Walkthrough

Giới thiệu

[EDIT]: One of my coworkers was gracious enough to explain to me how to properly divide a line in perspective in N number of segments. So I've fixed that section of the walkthrough, since I don't want to induce anyone in error --- This is NOT a tutorial. I needed to draw one of these windows for my webpage and decided to make a walkthrough so I wouldn't forget the steps I took