for anyone unsure of what a toneblock is
tbh, i dont think you get a clear answer.
somebody might be able to tell you the depth of toneblocks used by musicman... but that is mahogany in basswood... what use is it ever going to tell you about rosewood in paduak ?
I guess the main criteria for a toneblock, if you wanted to bother with such a thing, is that it should sufficiently couple with the bridge and the neck, so maybe as deep as the deepest bridge screw/post and deeper than the pickup routes
the musicman approach seems to be an attempt to get solid mahogany tones with a lightweight body, which it does to a certain extent - but not fully.
rosewood tones with a paduak weight body doesnt appeal as much since both are heavy woods
so... can i ask, what are you trying to achieve?
paduak sounds pretty good by itself, what are you hoping to get out of combining it with a big block of rosewood... other than extra work and the potential for tone voodoo