Improving Airfix windows

One aspect of Airfix building kits that really bugs me are the terrible window mouldings provided. Great big slabs of things you are supposed to hang on the outside of the model. They look (IMHO) terrible. Certainly not good enough for my model bungalow.

Fortunately, the solution is simple - spin the plastic part around and fit it inside the model. Then add a length of cill using some 1.5mm or smaller plastic strip.  OK, the "back" of the moulding will benefit from a light sand to remove the marks and flash, but that's a very quick piece of work for the results.