Slotted hinges with the point well below the joint. If it were a bigger model I'd be tempted to make little two part aerodynamic covers to protect and streamline the hinges. Still need to do a little sanding on the trailing edge of the flaps & ailerons to smooth things out and add the top sheeting on the wing.
Here's flaps at full deflection - or perhaps even a little over full deflection in flight. The target is to open up a gap that's a maximum of 5% of the wing chord according to the source I found. Any gap beyond that and it's a sharp curve of decreasing lift, which is the opposite of what flaps are supposed to do.
Gluing in some hing mounting reinforcement blocks for the aileron hinges.
Adding back the part of the trailing edge I cut off that sits on top of the fuselage. I do think this was the best way to make this modification - a long straight cut is easier to be precise compared to ending in the middle of the trailing edge and doing a sharp 90 degree change of direction of cut. But I can't claim I got to this by planning - it's just a happy accident.
To take the dihedral out of the wing spar, I just glued the pieces to each other upside down, and then cut off the parts that stuck out and didn't look like a straight rectangle.
That worked just fine, so with a little sanding here's the wing clamped in place with the reinstalled trailing edge. And here's where we look at those wiring tubes in the wing and think "gee, if only the wing clamped to the sides of the fuselage they would be setup perfectly!" :black_eyed: *sigh* drilling an access hole for wiring and removing the last segment of tube is on the task list. Dihedral at this point is 3mm at the wing tip, which is pretty darn close to nothing.
Couldn't resist pinning on the wing tips and seeing how she's going to look.