Thank you all. These are quite large, and the largest has some 467,000 nodes, so I can image that it would take several weeks of full-time work to manually trace them. Thank you all for your suggestions. I ended up enabling the grid and guidelines, as you suggested, and manually rotated the image us...

Okay, so I have some blueprints in BMP files that I traced. I used Path>Trace Bitmap to convert the BMP to a vector image. One issue: since the original scan was not perfectly aligned, the whole image is rotated clockwise a degree or two. I could use the Rotate tool to approximate aligning it, but I...