>"But what's wrong with a little mathmatical
>confirmation of tribal knowledge?"

nothing. i don't think i implied anything was. my interest in
this is due the that fact this is a builder email list. i wasn't
sure how or why this stuff would make your frames "better"
if you did not have the building part down first. that's why
i asked if there were any builders here that consider these
issues during their builds. for the record (i noted that) i
don't. i might also reiterate that i never considered it.