Dear Captain:
Nice Approach make sure you seal the cardboard, Then fill with modelers putty. smooth and sand and paint like a old fashioned plastic model. I suggest going to an art store and get gesso to seal and give the paint an even surface to stick to . Again I suggest first to try out the sealer and paints on some scrap cardboard first.
Good luck,
Miles
Now I looked where you are in the world and I did spell Gesso right just google (web search) it to find out what to look for in your Language as it is from Italy originally.
MSL
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