i know that mmg is sativa dom and therefore is going to get pretty tall.. how tall exactly, i'm not sure as i haven't grown mine out as of yet, but i'd think they would be more on the tall side of things, so if heights an issue, flower them a bit sooner..
this guy i worked with went to the dam a few years ago and when he came home he couldn't shut up about the martian mean green.. ever since then i was on the hunt to get me some of the beans... it took me like two years to find a pack of the regs as dna had stopped making the strain for a few years.. like a month or two after i finally found my pack of regs, dna turns around and released them in fems, lol..
i'm glad i got the regs, but still, lol... i'm sure you'll be stoked on the mmg though..
also, you can talk to sr verde, he's a member here and good people, i know that he's grown out the tangerine dream and could surely help answer pretty much any and all questions that you may have about the strain..
hope that helps and points you in the right direction, good luck with the grows...
