Hi David,
It is possible to change the schema that comes with the solution. The join view that shows the last inspection will need to be deleted temporarily to unlock the schema.
Please send me an email: j.smith@esri.com and I can help you with more details based on the changes you need to make.
Thanks,
Joel
David and I reviewed the schema changes and landed on a workflow of using the solution as inspiration and building out similar products around his own feature services.