Well done Matt.. I heard it’s a really tough race. (There must be only one ‘world’s hardest MTB race’ left on your list now .. )
There are so many good stage races out there, it would be tough to do them all. The only other event that I know of that calls itself the hardest is La Ruta, but at 3 or 4 days I just can’t see it being harder and people who have done IB and La Ruta say there is no contest.
On the to do list:
Breck Epic
Singletrack 6
TransPyr
Sudety Challenge
Swiss Epic
Maybe Cape Epic too, but as a pairs race it doesn’t appeal as much.
If you mean the self-supported events/ITTs, no plans yet.
IB is all based around Cuneo in Italy, you could get the routes from Strava.