He tries.
So my oldest had a school assignment that involved levers, pulleys, axles, wheels and such. The project required building a "simple machine" using some of those elements. I asked Tatiana what she knew of that met the criteria - she settled on a tank.
I had her sketch it up, and we got to work.
She'd planned for a tub and turret made of wood. I told her to GTFO and we'd be using steel.
Long story short we used most of the elements to come up with a satisfying result. Using some previous skills, and some new ones... like welding.
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Better than me.
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Not quite 8, the size of a 10 year old, with the intellect of a teenager.