In the future, there is an extension on the gun mount that extends forward and attached to the gun shield. That allows for the angling. That is really a factory kit that is being distributed to units in the field. In the meantime, unit workshops are making their own. So accuracy is not really necessary as their seems to be no real standard for fabricatied gun shields.
Given such an old kit, you did a great job. The scratchbuild additions to the doors are well done and you should be proud with that.
Some easy fixes that you could do in less than an hour are painting the indicator lights on the sides. These are the little circular bumps and the half circle bumps on the front and rear sides. The front is orange and the rear is red and can be seen in the below photo from Olive-Drab.

The other thing you can do is make a radio wire for your radio antenna with wire. I usually twist thin-gauge wire, but a single length works too. I don't know the exact length, but I am sure Epi, HeavyArty, sopmod6 and others could answer this.
Otherwise, good job. Remember that you may not be proud of your scratchbuilding now, but this stuff does not come overnight much less in just one model. The cliche "Practice makes perfect" holds much truth here.
Jeff