As You've said in your part 3 of Blender 2.8 basics, to model car, plane, snowman, pla net, person and camera. I've did them just using primitives, but I didn't even used edit mode, modifiers, or n o such things, just Shift+A, G, S, and R and then little bit of materials. I used 2.79b, don't ask me why I'm not usi ng 2.8 coz my laptop doesn't have openGL 3.3 support😕😭. Anyways I didn't even used Cycles, just Blender internal rendering engine. One thing was that I always tried to say that "I'm an Intermediate in blender"... without doing nothing... But today when I did these models, I'm getting great spirit and motivation within me... Thank you so much for giving me this Challenge...