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Internet of Things Class
Cutain control could use a reversible motor, with a tension arm and idler pulley to move a curtain pull type of endless rope pull. To stop the drape when it reaches open or closed position use limit swtches mounted on/above/under the curtain rod to sense end-of-travel and stop the motor. There are a number of add on system on Amazon and DIY how-to videos on youtube for this.
Lesson 2: Drawing Technique
Great little box. One simple suggestion. In step 5 you could cut the nail slot pieces as one piece and not cut into two pieces until after step 8 where the nail holes are drilled. This would be a simple change to make the nail holes register accurately with no fuss.