Since
a) I am familiar with Dembski's work - which is rarely clear and often shoddy
and
b) I am not aware of Dembski claiming to have constructed such a model.
c) To the best of my knowledge it would be impossible to construct model capable of giving a reliable result (not even an estimate to within a few orders of magnitude)
I do not accept your word that Dembski really has done what you claim.
These are reasonable objections and you have a reasonable answer - to point me at this model. Simply asking me to accept your word will lead me to the conclusion that there is no such model.