Matt and Waldorf, yep the foam blocks are between the pylons, thanks. Had seen the vid, but not sure about the foam, as on the 18 the foam was aft of the pylons.
I am installing two ports, one between the pylons, one aft of aft pylon.
Amazing, the H-16 foam was dry and intact, so am leaving it in place.
No delam; sealed the between foam with epoxy, does not rain, will install the ports today and let the cure.
Am working with a Hobie 18 hull and a 16. The 18 foam was sogged and wet and removed it for pool noodles, the 16 was fine.
All is well.