Hi,
This is a word addon project Which will be developed using VSTO.
I have done se vetal such projects in past and very well know the Microsoft architecture to achieve this kind of functionality.
I have even solutions where, you can save the snippets for later use,
On a click of a single button, the whole snippet containing text images etc will be inserted right into the paragraph of the document.
Please connect with me for more details and we can get started onthis ASAP
Thanks