Bhai, sbse pehla kaam save the "TIKLI". the mechanic is a dashhole who is doing flame work and not yet removed the plate. if the plate gets stolen, damaged or destroyed, then consider your car value to be down by atleast 20-30k.
second, get the car a good good wash. the engine room needs most, remove necessary items and wash it. After that u will know whats the true condition is.
re strengthen all the gadri, and the mukkis and the related structure. Scrap all the paint from engine room and re do everything. agar engine nikal dya hai to dont do half cooked job, spent some more and complete it.
remove the wiper plate also to see the damage. clean that area too.......
as for brake booster is concerned, fx engine room has lesser space to place the booster as compared to mehran. the mechanic should place the booster beneath the dashboard with some jugaar i think.
Wasiey now a days i have got an fx in my hand also, its stock brakes are much better than the stock brakes of my new 2016 model mehran.
One more thing, inspect the floor area where the brackets are which holds the kamani. if its rusty, re strengthen it also to save later hassle.