The official plans show NO controls at all, so whatever you do is legal.
Back in the day, Jim Walker would either collect a royalty or sue for it. So some designers either showed no controls or some bogus system that everybody knew would be replaced with a bellcrank.
I like my controls on the bottom of the wing with an adjustable leadout guide.
It's tough to get the leadouts inside the small elliptical wing.
I like to start with buttons and leadouts for test flying. Then if it goes fast enough to be competitive, you can switch to hooking up at the buttons.