Very Cool an old seven channel FG Gold case which is a module based unit. These were the top of the line for Futaba back in the day before computers types and even had rudimentary aileron to rudder as well as elevator to rudder mixs.

I have one in hand now rather than going on memory, also have the four and five channel FG's.

First your radio is narrow band and of course still legal as are all the Futaba FM's as well as the PCM's. There are three options on that radio. The gear switch on the top left side which is a two position switch as you know and this could be used. the second two options are the vertical sliders on the front face lower center (channel 6 and 7 I think) These would be used if you want varible adjustment which can be fun sometimes. And yes agine the left one definately is the easiest option but the right side could be used and if so the normal technique for mode two setup would be to not use the right hand but instead to reach accross just as if you were adjusting throttle trim but move the thumb a little further to find the ch 7 slider. Its not all that hard, easy in fact if you practice a bit while watching tv and find the slider with that left hand without looking.

You do have my curiosity up A70 when you said gull wing and my mind immediately thought of the big Top Flite Stinson but that not sixty sized so got a picture

John