[rbanffy]

> you need to deliver so much material to orbit

Not that much. You'll need an inflatable module (so the wide part can still fit in the cargo fairing of an SLS) and a carousel that can be assembled inside it to rotate and give the crew enough gravity to counteract the effects of the zero-g environment. You'll need power to keep it rotating and radiators to get rid of the heat.

The unfortunate thing is that this cannot be tested attached to the ISS as the vibration would ruin the micro-gravity environment crucial for many experiments there.