I have a Simmonds Hood,
some photos :
at the rear, there is 2 internal latches :

detail of the rear latch :

full access at the rear :

at the front, 2 external latches :

Only concern, no possibility to mount the standard external perpex wind screen without large modifications, you have to use the internal glass wind screen of Simmonds (beautiful but expensive).
Very simple, easy and quick to use. Previously the car was fitted with the original Morgan easy hood, and the previous owner replace it by a Simmonds hood.
Why? I don't know, but no problem with it under huge rain.