@nmckaskle
Without a BackUp it means that you have to do more work.
Hopefully you still have the Sketches used to create the Bodies? It is good practice to Hide rather than Delete Sketches. If you have access to Sketches that may lighten the load a little.
Any Notes regarding Dimensions involved will also help.
Ongoing I strongly recommend that a BackUp is made regularly, particularly when, e.g., removing part of the Tube to form the aperture.
Hit the Design Thumbnails Icon leftmost in top left menu [4 Rectangles].
Press and Hold on the Design in progress until it’s user edges turn Blue
Near the top right a set of Options is available.
Choose Duplicate, this will name or rename the Design with Copy or append Copy to the name.
Ensure that every Design is appropriately Named in a manner that best informs regarding the content.
Leave the Original Design as a BackUp and work on the Copy version.
This is a really easy process to do and it takes very little time.
The most tedious aspect is the Naming of Designs and Filing them away in the iPad Files App.
The alternative is to search through all your Design Thumbnails every time you need a specific Design.
Note there is no satisfactory way to maintain Design Thumbnails in any specific order, every time a Design is opened it moves to the top left position.