Gunblade a decent item for mundo?

I cannot stess that if it was to be built, it would be AFTER a core tank item or two. the reason i thought of it is becuse his cleaver would get the full benifit of the spell vamp, it would give him better auto power especially with his E and the items active would help perma slow people with his cleaver if people are not to good at landing them.

On paper, it seems like a great offensive item for mundo after tankiness has been built.