Dave's Shop From Scrap series has been around for almost 40 years now and it still garners interest. I have a full set of all his books in paper, I also have many in my files that I have downloaded over the years. The problem is most are poor quality scans, and I would not repost them without redoing them to a more presentable state. Browsing some of my files recently I found a second copy of "# 2 The Metal Lathe" that was in reasonable shape. A little out of alignment and the picture res. is poor, but very clean and usable. If you haven't found a copy yet, this is one of the cleaner copies around.
To download "Build Your Own Metalworking Lathe From Scrap" go to my Books - Free Downloads page, # 80 - 1.2 MB - pdf.