I really like the fluted barrel on your gun. Beautiful. Too bad about the breech end. Well, if you plan on restoring, it looks like you have your work cut out for you.
By coincidence, I just purchased a Jezail myself. I plan on restoring this one to a shooter. Mine is rather plain and un-decorated, but it's all there. Even the sling is original. I bought this one because it has a genuine British Barnett trade lock. The butt stock is broke where someone crudely glued it together. The glue is still soft.
The trigger guard is broke - and likely the same person tried to glue that back together.
But it's all repairable. I plan on tackeling this project sometime next year. Too many others to finish at the momment.
Keep us posted as to your progress. Thanks, Rick.