Ok I found the big rules pdf for the ongoing campaign. I modify my question thus. Are you currently accepting new players in your campaign?
Hey, man, good to see you. This is Rob from the Facebooks.
We absolutely are accepting players into the current campaign, because the way the game is set up we can drop people in or out very easily, and there's no real upper cap except via the sheer size of the playing space. My very strong
recommendation is that you play as an NPC first (essentially, you come out and play, but don't worry about running your own lance), for the duration of the group's next contract (~4-6 months), which is just about to start. That will give you time to get comfortable with our group and how we handle things (and to look over the rules and see how they work in practice) prior to jumping into the deep end of the pool.
While we have a few house rules, they're mainly used to streamline the way initiative works when we have 8-20 players around a single table; otherwise, the rules you've picked up from MegaMek will hold you in good stead.
FYI, we play roughly monthly, and the next game will be this coming Saturday (Nov 11th). If you can't make that, then don't sweat it; the following game is scheduled for December 9th.