Do you think Fatah series is still using old steel based casing?
I think Fatah series is a significant effort to modernize our BM inventory and we are going the US way in this regard ;
LM developed PrSM for Army for tactical battlefield strikes .PrSM is really a very simplified & scale-able design.
4m in length, 0.4m diameter class rocket motor , 100kg warhead size and almost 500km range.
Just like F2 that comes with 7.5m Length,0.4m dia motor,365kg warhead and 400km range.
LM adapted the same PrSM for coastal based Anti Ship defence.
The U.S. Army successfully used two Precision Strike Missiles (PrSM) against a moving target at sea, marking a first...
www.navalnews.com
Similarly,F2 is adapted for naval role aka SMASH
The way forward is simple:
Open systems architecture,
Modular and easily adaptable design.
F1 & F2 will make the work horse strike inventory while F4 may be focused towards more survive able solution aka the spear head of pak strike capability.
Let's see how it plays out.