Hi Chuck,
Alexis is absolutely correct.
The Pfalz D.III/D.IIIa, D.VIII, D.XII had clean hulls without nails and screws.
Only a few screws, for example the screws on the hinges of the maintenance hatches and on the outer metal fittings where the seat belts are attached on the inside.
However, you should not forget that the longitudinal seams on the fuselage - i.e. where the sealing tape was glued over it - are visible.
Here is a nice picture of it, directly behind the edge of the cockpit you can faintly make out the glued-on fabric sealing tape:

Servus
Bertl
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