Supposing one had the essential elements of a 6105-8000, the case, the back, the bezel, crown, what would one need to build a watch? Crystal, gaskets, dial, hands...all easily attainable in some form or another. But what of the movement? What 6xxx movement can be dropped into this case (other than a 6105 of course)? What additional pieces vis-a-vis spacers and such would be necessary? Are there 6xxx based watches that would have everything one would need?