

no.
the reason why planets are formed (ideally) as a sphere is because gravity forms it into that. The sphere is a product of gravity not vise versa because each little mass of substance generates it’s own radial attractive gravitational field.
even if you formed it into a disc, it would be formed back into a sphere.



not to mention the “human made” elements only last for a few days. einsteinium lasts around 23 days!