My rather infrequent, and possibly apocryphal, 'books project'.

[3dcheapskate]

I couldn't help it, just corrected the alt geoms for flat hardbacks 5-8 - I'd inadvertantly nudged them all up by 0.00009 in Blender.
Once that was done I added the MT related ERC and... well, it's all done ! And the bit I put in the scripts to be able to cope with different sized stack figures seems to work too ! Three 24 book stacks each consisting of 3 BookStack8 figures, randomized with the existing scripts

 

[3dcheapskate]

One more thing I didn't do - set the limits and hide most of the parameters. I've just written a script to do it, but I thought it best to record the values I used in the 4 book stack

The reduced limits on the xRotate, zRotate are to stop accidental click-drags in the preview pane (or intentional use of the twist/rotate tools) from totally screwing things up, and on the yTran to prevent opening up gaps in the stack.
The proportions, size, and thickness were mainly to keep all the books around the same order of size and prevent ridiculous stacks with huge books on top of tiny books

 

[3dcheapskate]

...I forgot that the yTran of book 1 is different as it doesn't have to react to a 'Plump' of the book below. The yTran limits for all the other books are:

Min = -0.0024
Max = 0.01

 

[3dcheapskate]

A zip with the should-be-all-done-now CR2 (plus the script I used to set the parameter limits, initial values, visibility, etc), just as a backup...