Steve, UAL
thanks for your concern. The pictures from a couple of posts ago were taken with the supplied stab tube installed and fully inserted, so that the root of one half touched against the root of the other half. I did so hoping to sand them in parallel, to ensure that both had the same height and length. So the dihedral seen in the pictures is the dihedral that is built into the stab, no more and no less*. Bending the aluminium tube is not a good idea, since the phenolic inside the fuselage would not be very happy about that... So I probably will cut both bevels away and re-install 10mm light balsa sheet and sand the bevel on the other side. Thanks for the information, I'll let you know if this unwanted dihedral is of any help, I might as well want to build another stab so to have a backup in case this one doesn't work at all. I still believe the concern is minor, but flight tests will eventually prove me wrong (I hope not!).

I'm hoping for first flight on land in mid-may and on water for our international F3A-H (hydro) competition in september. I'll keep you updated, I like this plane very much and hope it'll fly accordingly!

Regards,
-Fabrizio

EDIT: *what struck me was that the upper side was exactly flat (see photo #2), like a wing. This is why I asked in the first place...