I don't recommend using CA hinge on this plane because:

1) If you have large deflection like 45 deg, CA hinge will give you lots of resistance at those large deflections, which will require a higher grade servo. Doubling up CA hinges will simply double the resistance.
2) The wood used on Flip is soft balsa, and it's easy for CA hinges be ripped out w/o
3) Never use CA hinge on rudder w/ tail wheel because stress from landing will surely break them. I've seen this happen on more than enough planes. Fortunately, when rudder hinge breaks in the air, the plane can usually be landed safely.

I did use the metal hinges that was supplied. But I made V grooves in the joining edges so the hinges' barrels don't cause gaps.

My metal hinge did start to break for the rudder, because I maxed out the deflection, and from landing stress. I'd recommend using Robart Point hinges for rudder.

For elevator and rudder, make sure you increase the bevel before hinging. Without doing this, it will only allow you +/- 30 degrees of movement unless you have big gaps.

Also, make sure you install the tail brace. My tail came loose after vertical descending powered spirals. Fortunately I landed safely.