What do you mean by a “build log”, though?

To me that is a detailed diary by a particular builder, so will reflect his or her specific equipment and methods.

The most you will find published are explanatory notes suggesting how the components can be made, as the author made them. The entire set might be an umpteen-episode serial in the magazine; and although potentially very helpful for that project cannot be said to be a “building log”.

Such an article is not a guide to choosing what engine to make, but whether to make that specific engine..

What it can help us decide though, is how simple or complicated, easy or difficult, may be its subject for us to make. For that we need study the drawings and ask ourselves, “Can I make that with my equipment?”

The text does, or should, add further details such as assembly notes, valve- and ignition- timings, suppliers of castings or other specifics, etc.; but the drawings should be the main source of information. One hopes.

In the end we as builders can assess any candidate project only against our own abilities, time and money, and the limits of our workshop equipment.