An assembly file without part files is useless.
Your part file still has unconstrained sketches.
You must have missed pg 5 here http://home.pct.edu/~jmather/skillsusa%20universit
Sketchs 7 & 9 are sick (i in circle).
In the real world products are manufactured to dimensions with considerations for Design for Manufacturability.
I recommend that you start dimensioning your sketches.
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