Create a specification for your builder.

Before you start building, you'll need to prepare a specification. This is a document that describes what you want to achieve, and it will serve as the blueprint for your builder.

The more information you can provide, the better. The builder will use this as a guide for their work, so if you leave out any details, they might not be able to finish your project as you intended or make changes that are necessary.

It's also important to include pictures of what you want—this helps ensure that the finished product will match your vision exactly.