The core design of Azm will all depend on the engine selected. Pakistan doesn't have the luxury of an established industrial base to design and manufacture an engine specifically for Azm, in contrast to say the historical approach of the US or Russia who layed down the specs of their fighter development programmes and left it to engines designers to develop appropriate powerplants. The Chinese have had to build a similar capability over a number of decades. For countries like Turkey and Pakistan, the design specs of their fighter programmes are essentially tied to whatever powerplant they can secure. The same approach was used for JF-17, it was essentially designed around a single Klimov RD-33/93 series of engine using the Mig project 33 as a basis. For project Azm, the first decision to be taken before any detailed design work is done will be the engine...which clearly already has been decided upon.