tnh, pnh and Abi over at Pendrift's the other day, and our hostess mentioned that she had seen what she described as a 'granddaddy Dalek' in the Royal Military Museum, ten minutes' walk from my office.I popped over at lunchtime to look at it myself, and it's clear that it's one of Davros's earlier designs - the Mark One, Two or Three, perhaps.
In fact it's a German artillery piece from the 1890s, set on rails (not sure if that's for transport or to deal with recoil).
There is just space inside for a small German (or Kaled) soldier:
But it must have been rather uncomfortable. Also, noisy.