Hello Will,
I found your stack in my list, i filled in my sitemap.xml.
In your stack . I think i have to do more.
I am building now https://www.bwbshop.de
https://www.bwbshop.de/sitemap.xml
https://www.bwbshop.de/search/search.php
How to install your stack?
Greetings
Tony Breukers
info@bwbshop.nl