I’ve looked at all the Delta / Kossel sizers that are linked from the RepRap Wiki. There are several good ones to understand Delta / Kossel.
However… none of those seem to account for “real world” construction, such as offsets for a linear slider, or calculate the length of an extrusion to allow for a certain size bed, or similar.
Therefore, I am writing one. As of this date, it is incomplete.
Check out the progress so far: here.