OK Guys AL HAMD U LILLAH, I installed EPS in Margallah last week successfully.
It was a simple and straightforward procedure. Steering rod of my own car (manual steering) was installed in the EPS housing for the Japanese car. Actual pictures are shown below.
So complete EPS assembly was bought from Chah Sultan RWP as shown below

It had NSK motor (a good fluent and big one) and Mitsubishi Japan ECU G6).
This picture of my orignal manual steering rod
No change here same orignal rod was re used.
Than the EPS housing was cut and housing of my orignal steering was welded with EPS housing (after measurements, ensuring same fittings in the car i.e. no alterations or changes) as shown in pictures below. And my orignal steering rod was put back in the new housing.
Than small procedure was done to carry out the electronics connectivity. Its simple there are 2 wires which go into the the ECU, i.e. power line and speed input (which was taken from speedometer. and than one jack goes from EPS ECU to motor managing it.
Wiring was 5-10 minutes job as shown in picture below
Afterwards all the bolts were connected back to orignal places and AL HAMD U LILLAH steering connected and working very fine.
its been a nice experience. thanks to @Vaqas1 for guidance and help.
I am available for any queries and guidance if required.
Hope the information is helpful.