Disassemble the whole chassis, buy industrial grade aluminium and an industrial furnace.

First create a mould after fixing the dent by putting some putty where the dent is and sanding it out.

Later use the furnace to melt the industrial grade aluminium and put it in the mould.

Take out the fresh new chassis and anodize it in even blacker black, later put everything together and enjoy your fixed better than new laptop. :)

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If you want to go further in modification get industrial grade titanium, might even go further for radioactive substances so it powers itself but that can get slightly expensive.

Well this time Dell did it first.

I mean with that colour, bet.

Do we not know?