Thanks for the advice.
And don't worry about "micro" soldering... I have designed & built a 1 Gramme radio-controled airplane ( 3 proportional channels= rudder, trotle, elevator), doing the soldering under magnification glasses...
Here is the plane in my hand.Warning: Spoiler! (Click to show)
That's phenomenal! You should sell those, I can imagine kids (and adults) would have a blast with those little planes.