I have been lurking this forum for some time ... have followed your discussion and tried some of the ideas you mention ...
biggest problem I have encountered was getting the zapata and zaptel pieces to compile properly ... suspect that if I had been more patient, would have eventually figured out how to do it ...
as it happens, I chanced across a site that had pre-built RPMs for RH 7.3 for the zapata, zaptel and libpri pieces ... I just installed them on my SME 6.0.1 (fresh install) and they dropped right into place ... my Digium cards are ALIVE !!!
the link to the ftp site is
ftp://ftp.nacs.net/asterisk/rh73/RPMS/hope this saves someone else the 2 days I killed trying to do it myself ...
regards