Thats good. Now i will recommend another mechanic to go to and discuss each and every item on this list with him (show him the items only without prices ofcourse). He will also thoroughly check the items and tell if needs replacement or not.
Mark what he says on this same list and let know again (share the new list then).
Jist be patient... Dont worry abt the 4 lac thing. Lets go/move slowly on this thing.
The main critical thing is the frame welding. If its really broken, then it should be fixed first. But lets see .. show to this other mechanic too.