Alright team, time for an update.
Mom 1 (peanut): gave birth to 6 babies, she killed 3 pretty quick then killed the other 3 by peeing on them/they got cold.
Mom 2 (zelda): Gave birth to 2, kept building nest on wire. Brought them in to try and keep them warm. Both ended up dieing despite my efforts otherwise.
Mom 3 (Muskrat) gave birth to 2 this morning, both dead on wire when I got there. Still nesting as well.
When I acquired muskrat and her sister (a silver chinchilla looking critter), they had been housed with a third "sister" who turned out to be a buck. They never bred, and I thought maybe they where too young (4 months). Turns out Muskrat was pregnant, her sister, didn't look like it though, so I paid no mind.
I left tonight around 7 to go pick up a few things at the store. Came back around 2-3 hours later. Zelda had given birth to 3 more kits, on the wire, but in a very well constructed nest at least, and they where warm and fed. Muskrat is still nest building, and looks like she may birth tonight. How many more, I'm unsure. Muskrats sister- the chinchilla, gave birth to 7 kits on the wire. I grabbed all the kits from both moms and rushed inside. One was mangled, and I knew it was a lost cause. I put the other 6 in front of the heater with a small glimmer of hope, I thought I saw movement but honestly they looked dead.
All 6 are now alive and kicking, and the 3 from Zelda are good. 9 good kits. I didn't want to return them to the chinchilla, she had no real interest in even pulling fur, I don't trust muskrat with her nest building, so for now, all are warmed up, together, and put in with Zelda. She's done a great job of nest building and I gave her a fresh box and a ton of straw. Hopefully she can figure it out from here, she seems like she's going to end up being a decent mother.
Muskrat still nest building, and another doe (older proven doe) is nest building now, so I can hopefully pull a few from zelda as 9 is a bit much for her I'd think?..
Anyway, if anyone has any suggestions let me know. I tried to use Peanut to nurse the kits (supervised, indoors) but no luck... The 6 from the Chinchilla haven't been nursed but they should hopefully make it until Zelda's next nursing.