RF-4's B,C, and E

Im looking for anyone who knows what it would take to modify a B or E model to to a RF-4C I recently found Hasagawa has the B and E versions in 1/48, something Ive been looking for for years in the C version but have been stuck with a the old/crappy testors kit and Im not even sure its a C version. Also, if anybodys familiar with the two Hasagawa kits what do you think of them? detail good? The Testors kit has an empty nose with clear plastic on the camera lenses so you can see right through !! is this the case with the hasagawa kits? Any info would be greatly appreaciated.... and thanks in advance.