People keep talking about "Federalizing the National Guard" and now you've got other States pledging their NG to Texas in defiance of the Supreme Court (see image).
I don't think the conservatives are sufficiently unified to form a single opposition army. The problem with basing your appeals on hating "outsiders" is that you end up with a lot of internal hatred too. There's also a strong undercurrent of "no one can tell me what to do" that makes central control unlikely.
What seems more likely are terrorist incidents, carried out be individuals and small groups, without any overall communication or strategy. We're already seeing some of that. The lack of coordination won't prevent it from happeing, but will prevent it from achieving anything.
I don't think there are very many people within the MAGA movement who honestly want to resort to violence, whatever they tell themselves. The ones who are actually willing are the ones who wanted to hurt someone anyway. Politics provides them with an excuse, not a motivation.
I think we're going to have a nasty time for a while, but I don't think a right-wing takeover by violence has any chance of happening. I'm much more worried about a political takeover that then turns into an authoritarian coup. The left-wing has a much better chance of organizing as a whole, but I don't think there are that many people ready to fight from that side either, but that could change as conditions get worse.
The right has been used, and steadily intensifying stochastic terrorism for a while now. You're right, it's not a strategy for a military takeover of the US. It's just one step in the political takeover.