I do not have a tutorial to submit, but I did create a Web UI for visualizing and creating PSBTs & Transactions.
You can find it here: https://bitcoincore.tech/apps/bitcoinjs-ui/index.html

It is intended for developers. Please let me know what you think.

GitHub Repo: https://github.com/bitcoincoretech/bitcoinjs-ui
Wiki includes step by step instructions and a video tutorial.