This is an alternate design for the ship “Discovery” from the film 2001. In my view it is much inferior to the final version, but this is interesting. This one tends to self-shadow a lot for one thing, which makes it difficult to light. But note that the habitation sphere is identical to the final version used in the film – this element was about the only constant factor in the many design changes.
It is based on sketches in Chris Frayling’s excellent book “The 2001 Files”, and my version incorporates elements from several sketches.
I also did a turntable video of it, to show off the shape.
From other sketches it is clear that there are 48 fuel tanks just under the widest part of the vehicle.