Landing lights were an option (I'm not sure about on the -10 and 14) on the earlier kits. That's why your -6 doesn't have any.
Cutting the leading edge is not a big deal, just protect your paint with painter tape covered by Gorilla Tape.
There are many ways to cut the holes, once they are properly located and traced on the wing. After drilling a round hole with a step drill, I used a pneumatic body saw to cut the opening to rough size, and then filed to the final line. That worked out really well.
You will need a rivet squeezer and dimple dies to dimple the holes to hold the cover in place.
You can use pull rivets inside the wings to old the plate nuts in place, not a big deal, other than access is very limited.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC