Finally back with an update on this one. I've been researching and working on tedious details on the exterior.
Installed tubing for the control cables.

Here is the pulleys for the ailerons, made on the lathe.

Now I've got some paint on. The machines that the 90th aero squadron used where formerly French machines. They had the five color camo paint, and I believe, the light yellow / tan color ecru on the bottom. At least mine will. They likely also had the French roundels, too. This is the ecru color on the bottom.

Also, there are reinforcement patches where control cables come through the covering, which I have added in the form of decal film. There are also leather wear patches, such as the one shown here, on the horizontal stabilizer where the control cables can rub on the covering. These are decal film also.

One detail I noticed was that I have not found a single period photo of a Strutter with the elevator control horn positioned where they are in the kit. I have found a couple of line drawings, but not a single photo. Strutters were made by a number of companies, and likely at least one put the control horns where the kit ones are, but I will move the horns one rib bay outward, near the bracing cables for the vertical stabilizer.
Hopefully the next update will be soon!