Just a triangle of ply or osb slotted to take main board which is also slotted , can be assembled easily and will pack away flat.
Or you could fit feet fixed with L brackets
To stop the "missiles" travelling too far behind the target board hang a cloth sheet behind the target board as a back stop. The distance between target board and the back stop is best when about three times the diameter of the "missiles". Using a soft sheet for the back stop will prevent "missiles" from rebounding back through the target board and causing disputes about whether the "missile" did score.
Mdf gives nice smooth paint finish but is heavy and won’t survive wet weather but fine for one off.
Ply is fairly smooth but more expensive while OSB is cheapest but rougher surface .
Or you could paint your design on heavy duty lining paper and stick to timber .
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