I'd say it's a crap shoot. I'd probably do it myself because I believe I would 'probably' make it and I'm a high roller on making tight connections and never check bags. But I’m not sure I could recommend it to others with a clear conscious. Just too many variables and MEX may not be the biggest airport I have ever been to it surely must be the longest. You can end up walking a loooong way from intl. to domestic. I've usually cleared immigration fairly quick and never check bags so customs has always been a push button/green light/walk on through affair. Reclearing security shouldn’t take that long. As I said I’ve never checked a bag through MEX so I cannot comment on that. Ya’ feeling lucky?