After an ton of errors and an absurd amount of fees spend (testnet 3 is expensive lmao) I was able to write a script for a 2/3 multisig:
https://mempool.space/testnet/tx/2e063f971a1e75fa84fca1dc821b6b1b37b7c9fac59198bb8f3802e30d03f211

I have sooo much to learn, but this was cool AF.

Thanks for the btc bro