@capsat, this kind of transformation is totally legal as long as the original firewall and the identification marks (whether punched or on a aluminum sheet known as "tikli" locally) are intact.
@nasirkhan110 --> pretty impressive work you have here. Could you please tell me where you got the side body panels from? Did you fabricate them locally?
Hope this helps. Please feel free to put up any queries.
Fahad Bashir,
Assistant Collector, Pakistan Customs.