I'm not sure of anywhere I've seen it illustrated.
Do you have access from the end of the tub (an access panel or section of drywall that can be removed)?
If you have no access at all, you'll have to use a compression style waste, overflow and p-trap. Usually I prefer the PVC, glue up variety because they are less prone to leaks long-term.
By measuring and test fitting, you'll have to pre-install the p-trap, waste & overflow to the drain so that they will hit the drain & overflow holes of the tub when you drop it in place. Then finish the connection by attaching the drain pop-up and overflow eschutcheon (don't forget the gaskets).
Christopher Wright, WrightWorks, LLC
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