I understand the method you used. It is my position that we are Not seeing the TSBD "Exterior Wall" on the Martin Film. The placard shadows on the Martin Film are falling onto something that is "stacked" between the TSBD Exterior Wall and the East Gate. This stacked material decreases the "open space" your model is using to match-up the shadows with the Martin Film. The Martin Film "placard shadows" are being cast onto something that does Not resemble any of the other exterior sides of the TSBD.
Dissecting the Shadows
I began to try to model the shadows in the Euins clip two weeks ago, but had difficulty matching two prominent shadows in particular. These shadows appear below the center and above the two lower placards. In my animation the Martin inset has these two shadows circled in yellow.
The shadow on the right is due to the corner pilaster falling on the background. Note that the rectangular shape of the shadow tapers to point. This does not happen on a vertical surface, bricks or boxes. The east gate is anchored to the SW pilaster and is therefore only about six to eight inches from the TSBD’s west wall. There remains holes in this pilaster where the gate hardware was fixed.
The second shadow on the left side is due to the center placard and would look similar to the other placard shadows falling on the flat wall. However, this shadow is shortened to about half its expected size. This is due to falling on a sloped surface as in the lower (Google Earth) inset photo taken of that very pilaster in the Martin frame.
My animation has a simulated sloped top and provides the anomalous shadow patterns. My slope is a flat incline while the authentic slope appears to have curvature. I don’t think that could change my conclusions.
The background behind the east gate is actually the TSBD west wall. The Martin frames are soft making the brickwork essentially blended in with the mortar. Also note that nether the chain-link fence or TSBD south face breeze blocks cutouts are resolved.
It is not just Martin’s Euins scene where bricks and mortar are unresolved and appear blended as one continuous surface. Martin and Hughes both filmed with their 8mm film cameras and recorded similar scenes of brickwork of the TSBD and DalTex buildings that do not have resolved brick/mortar. I could not find even one frame from Martin or Hughes frames showing resolved brick and mortar.
https://i.imgur.com/a/cZ837E2.gif