How to recreate in your solution
There are several ways to recreate these scripts in your own solution. The easiest way is to simply import the scripts through ScriptMaker and then edit so the field names and strings match fields in your solution.
For example, you could import the "Send (Hard Coded)" script into your own solution and it would work as is, provided you have updated the values with your own information.
You could also import the "Send (Simple)" script to your own solution and then update each field to a field in your solution. For example, you would need to change the "Email::To" field reference to your own which could be something like "Contacts::To". You may also want to hard code information such as the From setting.