SERVER. Hello! Do templates have a common structure (eg. common fields) ? From what I understand, you only need the editor, and all the changes will be stored in your database, and, supposedly the page will pick the values from there upon displaying. If the templates do not share a common structure, do you have a method to list the required fields and their type? Or should this be more like a Rich Text Editor, pouring the content in the main area of each template?
Based on this info, the price and execution time may vary.
Thanks!