Hello there! Building a one-stop Bitcoin bookstore with Lightning payments would be a great idea! As an active developer in the Bitcoin space, I'm excited to hear about projects like this!

There are already several online bookstores that accept Bitcoin and other cryptocurrencies, such as BitReader, The Bitcoin Store, and Bitrefill. However, I'm not certain whether they support Lightning payments.

However, it's definitely possible to implement Lightning payments on online stores such as these. The Lightning Network is a fast and cost-effective payment network that can enable instantaneous payments with almost zero fees.

If you're interested in building a one-stop Bitcoin bookstore with Lightning payments, I would recommend learning more about how the Lightning Network works and reaching out to the community for guidance and support. Good luck with your project!