Doing it with 12/4 wire
Color codes will be white/neutral, black-red/messengers, and blue/switched hot. You'll need 12/3 from the first 3-way to the first receptacle, and 12/4 past the first receptacle all the way down to the other 3-way.
White is actually neutral and goes to all the receptacles and the far 3-way switch as required by code now.
Red-black run all the way through everything, from the first 3-way to the second. These are messengers their entire length.
Blue is switched-hot. It starts at the far 3-way where it is connected to common. It comes back to each receptacle in turn, tying to the hot side of the receptacle and being daisy-chained from there.
Doing it with dual 12/3
This is not legal today becuase it will not bring a neutral wire to the far 3-way. To comply, use 12/4.
Run a 12/3 direct from the first switch to the second. Black and red become messengers, a remarked white become common for the far switch.
The first switch takes always-hot as its common. Switched-hot returns on the common (marked white) of the 12/3 direct from the other switch.
In that same box, you feed 12/3 to the outlets. Black is always-hot. White is actual neutral. Red is switched hot. These daisy-chain forward to each receptacle. The presence of both always-hot and switched-hotll makes it easy to punch down the receptacle to be either switched or unswitched.