Sync move over to first box, grab in place with Lisa.
Switch to Rita, jump on held box.
Switch to Lisa, jump on top of ground box.
Switch to Rita, grab held box and place it in center of lava.
Switch to Lisa, Levvies, jump up, walk over to right, Gloves, grab the box in place.
Switch to Rita, jump on box, do "double jump" to get her up, Destroy box onto snake, Destroy underneath wood box.
Switch to Lisa, throw box (should already be facing right), Levvies, jump onto box and up to ledge. Gloves, grab box, throw left and stand next to it.
Switch to Rita and jump half-tile onto box. Switch-jump to get Rita up, then throw box and use Levvies to jump up as Lisa. Switch to Gloves.
Sync move over to box, push it off, grab box and toss it right. Sync move, align moms, make jump across lava.
Switch to Rita, drop wood box. Drop down and Destroy block under Armor, then under Slime, then move moms into position while waiting and sync move out.
The first part may be faster, but a little more complicated to execute, if Rita just jumps straight up from Lisa's box to the ledge, then Lisa moves over slightly so Rita can reach her box.