If you rely on parts lists...
C1, C2, C3 and C9 are Kemet 100nF/63V film capacitors and “huge”, but the footprints on the board are only for 1206, I could still fit one capacitor halfway, the other positions are simply impossible in terms of space.
There seems to be a discrepancy between the parts list, the circuit diagram and the board.
C9 is specified as X7R type in the circuit diagram and not as a film capacitor.
C1 to C3 are connected in parallel to the large tantalum capacitors.
The question is, do they have to be film capacitors at all, or would 100nF X7R in a 1206 package size suffice for all positions?
Personally, I see no electrical reason for this, but then I'm no metrologist.