SkipSinclair

I have a fully working, fully functional MAME .250 installation with full romset, extras, high score, cheats, overlays, marquees, bezels, etc. I'm just looking to utilize LB as a front-end to that installation - don't need anything additional, just a nicer front-end than the 1992 interface that MAME comes with. What's the easiest/least download-y way of getting everything from a working MAME install into LB? Sorry if this has been asked/answered in the past, I didn't see anything via Google or a forum search that seemed relevant...