Interesting, but a lot of the abilities might not work together so well. A lot of the paladin's weapon andd armor skills would be wasted, but gaining full bab would help the monk, but fighter with all the bonus feats might be better. Monk and fighter bonus feats combined would be interesting. Smiting might be nice with uut a cleric monk would do the turning, channeling and spell casting better. Paladin's mount would be largely wasted too.