Tow Mechanism Point

As I'm planning to use my Pawnee as a tug, the tow release point has to be of suitable construction to be able to take the loads of towing gliders.
As with other Pawnee tugs that I've seen I've chosen the location just behind the cockpit, which lines up with F5 on the plan. I discarded the laser cut F5 made from 4mm balsa, and made another one from 6mm birch ply.

I've also constructed a triangular brace from the same material and will epoxy this in place to strength the tow point.

Toying around with the idea ot using carbon tubes to brace F5 instead of the ply, any ideas welcome.

You can also see in the pictures the actual tow point which is milled from aluminium, with a 2-56 rod coming up the centre to hold the tow rope in place. A servo will be installed underneath F5 to acuate this rod.