They already have, they have to built it, the work was done during Mush era, I don't know why you Indians think that Pakistan can not make any thing. Since Mush time Pakistan have created a pool of highly qualified people in Space Science and many are working in esteemed positions to get experience and when needed they will come back. Every thing is not available on net and it is not good to put everything on net.
It is true that Pakistan is behind in Space tech but it does not mean that we don't have human resources to do the job.
Sad thing is that SUPARCO is one of the most neglected organizations in Pakistan, politicians don't care about tech they want money so it does not mean money is available if approved.