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Oh... you have gotten me wrong I'm affraid.Your work is really nice .Simply you made a few mistakes you avoided if you would asked Wayne Little or Airframes for instance.Now I don't suggest redoing the engine cowling.The antenna wire should be easy to replace.What are you going to use for that?
BTW Could you take a better pic of the radiator under the fuselage and upload it here?
Good work overall, but I understand how you feel if not happy with particular areas. i don't know enough about Russian aircraft of the period to comment, but for a first model after so many years, it looks good to me!
If you can't get thread from tights, and the sprue is breaking, then use 'Invisible' mending thread. Attach this at one end, using a toothpick or simialr to place a tiny spot of superglue. When dry , pull tight, and attch the other end the same way, leaving a long 'tail'. When dry, snip off the excess with nail clippers, and cut any remeianing with a scalpel, at the find end. Painting can be done in an appropriate colour, by using a fine brush, only just loaded with paint, and lightly running across the top of the 'wire'. This will give colour, without thickening the line.
Hope this helps.
Terry.
It depends on what kind of material you are going to use for the wire.