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@tom.
But the forces through the BB on a downhill bike are totally different to those through a rigid frame, so that is a bit of an engineering non-sequitur (specifically the fact that the suspension will be "taking the edge" off some of the forces through the BB).
Didn't Graeme build the BB on his bike out of part of a washing machine?
For the record I accept that you can have a very stiff BB on elevated chainstay (E-stay, as I knew them back in the day) frames, but it takes more metal to achieve it.
Changing the subject, does anyone remember the UK company Ozone that used to make aluminium elevated chainstay frames? They were awesome (although still no Mantis).