This reminds me a great deal of what I and my friends do via Christian ministry. We have a sort of elite group of 5-8 highly active men, and maybe 15 more who take part, but are moreso there to hang out. We also have a house, nicknamed the Greenhouse because the air conditioner blows the circuit breaker... but in any case we have a "home base" where we can discuss what we've been up against in recent days (i.e. on Tuesday I had an hour-long debate with a man from a local cult), and also to refine our knowledge of Scripture...
For making an MRA equivalent... the main thing you would need to do is find a few benefactors to purchase a house or two. From there, decide what your target will be. If it's college students, trying forming something like my "Lasagna Club" where you have regular cookouts or other activities to attract men, and from there you will find a few men who have been recently having problems with women, and are thus able to break free from the 'man bad, woman good' mindset. Also, let them know that you have some good housing nearby that's cheaper than what they would find normally. For older men... bring up the subject in a pub or wherever you think best, find a few men who might be interested, and work with them. All around the big key is finding men who are interested and building that interest, and in due time they too will become as active as you.
Of course, there are others who are not going to care enough to become active... but that's why the brotherhoods of old were selective. You'll have to use sound judgement in selecting who will be your elite core.