Hi,
Rudder core at 10g before honeycombing and 6g after.
A lot of work for 4g.
However the total foam (15Kg/m\3 variety) removed was 37.7g per wing panel x 4 panels, 8g per tail panel x 2 panels and 4g from the rudder.
That's 170g total in the bin.
Six Futaba BLS 173's weigh 168g.

Tail panels are at 27.5g sheeted.
The first skin took nearly 2.5cc of PU (Gorilla).
The 2nd took 2cc and the 3rd and forth skins took 1.5cc each to apply. I just had to get the nozzle size correct so as to control the quantity used.
Ready to try a wing panel now.

Brian