Here is the problem. You purchased a Revell rebox of the Monogram kit. The molds for this kit date back to the 1960s and they are completely shot. What's more is these are manufactured in China where they are using an inferior plastic. So it is no surprise that this kit is a putty fest. I am currently working on this kit. However, mine is an original "Blue Box" edition made in Morton Grove. So far, the fit, while not Tamiya like, is still pretty spot on. The plastic is quite robust also. Next time around I would suggest you find an original Monogram "Blue Box" or "White Box" edition. That being said, stick with what you have and carry on. Despite all the work you may have to put into it, it should turn out fine.