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Is there a source listing the hammer strike positions (usually measured as a percentage of the string length) for any of the major piano makers? I'm aware that these may be adjusted by a technician--I'm just trying to determine the original, factory strike points for each string.

The Piano Action Handbook by Randy Potter is probably one of the best comprehensive sources available for that.

Quote "The Piano Action Handbook
Edited by Randy Potter, RPT

Published by the Piano Technicians Guild
This book includes regulating dimensions (key height, sharp height, blow distance, let off, key dip, back check distance and drop) for most pianos available in the U.S. and many parts of the world. Edited by Randy Potter in 1991, it includes dimensions published in the First and Second Editions, plus all piano makes and models regularly available in the U.S./Canadian market. It also includes a vertical and grand action diagram, regulating explanations and notes, SAE to metric conversion tables for common regulating dimensions, grand and vertical regulating sequences, manufacturers' addresses and contact information and a selected bibliography. Every piano technician should have this book in their regulating kit.

Book (paperback, 74 pages): $10.00, plus shipping."

I cannot recall any factory making public the strike point for their pianos. There are references like Wolfendens book piano design and construction but the intent is to avoid striking the nodes of the partials that you want to hear. Striking the 7th or 9th node would tend to supress those as they are not that desirable.
Starting at note 88 there is not much choice - about 1/16' from the capo is where you get sound. Most of the time, a straight line from there through the bass will work out ok.

1/16 foot?

A lot of manufacturers use something like that, but typically about 1/4 inch is better. That is 1/8 the speaking length, somewhere around 1/7 or 1/9 nodes.