OOTB Order Confirmation/Acknowledgement with custom data model

Summary

Need to send Order Confirmation/Acknowledgement using custom data model

Content

We would like to use out of the box capabilities to send the Order Acknowledgement and Order Confirmations back to a customer and sales person.  Some of the desirable fields like Scheduled Shipment Date and Recurring Billing details are not available in the out of the box data model.  Additionally, the EFF and DFF fields are not available.  Because of this, we are not able to use the out of the box functionality to view and send confirmations. Instead, we are using a custom Order Confirmation report, but it means that our Sales Ops team has to go to Reporting,