Removing full heater unit

I'm removing the heater and ac unit from under the the dash, I want to save some weight and tidy the engine bay,
So I've removed 6 or so bolts in the bay, and under dash I've removed as many cables and hoses as I can see, but it still feels attached somewhere.

I suspect it's fender side, but I can't see any bolts ect.

Any help please.