Just a note of caution. A sharp trailing edge is ideal aerodynamically but it is a disaster structurally. If too sharp there is too little material for the trailing edge to hold its shape at times of high aerodynamic forces, as in landing, turbulence, and high speed flight or when handling on the ground..
In the extreme you can get the trailing edge flexing in flight giving poor stability and even a form of control reversal at high speed. In addition there is a possibly of permanent warping or even surface failure long term.
Tapering the Wing trailing edge is fine but DO NOT WEAKEN the structural strength too much or problems will definitely ensue!
Just a cautionary note!