Well I would just take this pretty slow. It took me 30 days to bond my two so I doubt you'll get it done in a week.
Start with brief introductions with a divider. Are they trying to fight through the bars? If not, then keep them next to each other but with a divider for a few days.
Then start switching toys and litter boxes.
Then move to bunny dates with all 4 in a different neutral area. My initial dates lasted like 5 minutes. I always tried to end on a positive note.
Gradually move up in time. When they can all be together for a few hours then you can try to move to non neutral territory.
Here is my favorite article on bonding. Granted, this has to do with bonding two but you can still take tips from it:
http://www.rabbitnetwork.org/articles/bond.shtml
Now, I do have to say that I'd be very cautious about trying to bond 4. The problem is that even if they all appear to be getting along, spontaneous fighting can break out at any time. And then the current bonded pairs are at risk for their bonds to be broken. Me personally, it's not something I would ever try. But that'd just me, lol, I'm kinda a cautious person. I wouldn't even attempt a trio!
So anyway, I'm not saying that to be a Debbie downer, just a realist so you know the challenges you may have in your future.
Please keep us updated!!! And I wish you the best!