http://www.kitsrus.com see K18v2
http://w1.859.telia.com/~u85920178/ see V5

6th grade is WAY too late to try to get them interested.
Disagree!

I did quite a bit with scouts, even the older scouts wanted to learn how to
build, just as a tool toward playing with their FM "bug". Anything that
stimulates interest is good.

BR H