Love the build, and like the others said, the 'rough edge' doesn't detract at all for me.
Having done some serious 'restoration' and reconstruction of woodwork and plaster details in our 1876 home recently, I can vouch for a product not unlike the 'Bondo' many of us may have used in DIY auto body repair over the years!
Spreads and sticks over an armature of just about any material, sandable and paintable!
Don't know if it is available in your area, (I'm in Canada) but amazing stuff!
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As this stuff sets, you can put a pretty sharp edge on it too! It sets up pretty fast, but stays workable for minutes, not hours.
The fumes are a bit much, so get out that organic compound filter ventilator, or use in a very well ventilated room.
Cheers!