There are many, many, many variations of Bess locks made by various manufacturers so no single set of dimensions is likely to be useful unless it exactly corresponds to the lock from which the castings were made and given the 2-3% shrink in the castings over the original model, dimensions from an original lock won't be correct for the castings made from that lock.
That said, the TRS castings all have hole positions indicated/centered for the major screws.
Tom