Thanks Mate
There was a bit of work on the horn but I’m happy with the result. I marked the shape i wanted out in two dimensions at the start then the rest was mostly done by eye. I used a French curve now and them to check for uniformity of both sides.
The 36 grit sanding disc in the 5" really finished it off nice and was easy to blend the shape, then i just polished it with a scotchbrite on my radius master when i was done. I would say if you have a good eye and a feel for this sort of thing definitely give it a go.