I never said a mfing thing about a walla walla, everyone else did. I would hope you used a square cutting the boards down to size when using a skilsaw for an example. Laying out window bucks you draw a line with a ...square. To cut stairs out you use a framing... square. In every mfing carpenters pouch is a speed... square. Once you install sheeting on walls and roof it holds the building ... square. if you shift one walla to one side or the other, the building will be out of... square.
Level plumb and square