If your sequins were one 10,000th of a meter thick, you would need to
orbit 30 km cubed worth of Aluminum.

The density of Aluminum is 2.70 g/cm=B3

The only way to do it is to have a Von Neumann machine. A machine which
will build itself. If you have to transport it from Earth it is indeed
an insane proposition.

Get out of here with your Global Litterbug scheme. End dependence on
carbon-fuels and you don't need to blast crap into space. Rockets emit
powerful lots of GREENHOUSE GASES too.

You need to mine the moon or asteroids. Aluminium and Silicon are
fairly common in the asteroid belt. Basically you need a machine which
will extract Al and Si from asteroids using sunlight, and will then
build another similar machine, as well as making Al foil.

VN machines have been associated with nanotechnology but that is an
erroneous view. A large (something of the order of 1000kg or so
machine) could be sent to an asteroid to build itself. Indeed VN
technology may well be the only true future of space. I have argued
elewhere that a manned trip to Mars will be a total nonsense unless
there is a house on Mars is already built and ready to be occupied.

Such a VN machine could also build a microwave generator proving us
with a complete non fossil source of energy.

I feel at some point I should probably start a thread specifically on
Von Neumann machines. For now I will simply add my bit to this one.