What aerodynamic data (drag/lift curves) exists for the L-159 Alca?
From Wikipedia, the aerofoil for the wings is NACA 64A-012. If you would like a full airplane, you would need to plot it in DATCOM. DATCOM is a program that is designed to calculate drag, lift, moment coefficient, etc. on an airplane based on coordinates.

So, here is a link to the polar data I got.

If you want more accurate alpha increase, you need to download X-FOIL and learn to use it (quite a tricky program for certain people).

I am afraid the other data is almost impossible to obtain.