If I really wanted to have no doubt that I could cut a servo opening and make it work

There's no need for any of that though. The inside decking already has the opening for the rudder servo and the cable openings are in the aft fuselage under the covering. Did I mention that the covering appears to be Ultracoat and is VERY red? Bottoms of all the wing panels are white.
The cowl is proportionally a lot lighter than the one on the bigger Suk. Also fits better. It fits "end on" to the fuselage with no overlap which makes for a very clean look to the fuselage. I'll do some more pics in the morning covering the cowl attachment and some holes inside the fuselage intended for those that use those long funny tubular things for a muffler.
The 3mm-53 fits completely inside the cowl. I haven't checked the clearance for the plug and cap yet but will get to that as well tomorrow.