[Avodah] To Stand or Not to Stand for a Chosson andKallah

[Poppers, Michael]

In Avodah V28n222, RZS responded to me:
>> I have a possibly-related Q: at least some of the many who stand for that last line first stand for all of "Mizmor l'David Havu laH'" (and then sit down prior to the start of "L'cha Dodi") -- why the custom to stand for that mizmor? <<
> AIUI, because it contains Hashem's name 18 times. <
Thanks for the thought.  According to this understanding, however, shouldn't those w/ that custom also stand for Shacharis' "Y'hi chvod H'" (which, incidentally, is tadir compared to the saying of T'hilim 29)?  Just to make things "worse": many of those people stand* for "Mizmor l'Sodah," which in certain siddurim is listed just before "Y'hi chvod," and then sit down!  Thanks. 

*) apparently a minhag -- al pi SA, no need to stand but rather "just" to say the mizmor "bin'ginah"

All the best from 
-- Michael Poppers via BB pager