"Bernard Randall" wrote in message
...
I am at the planning stage of replacing some deck hatches on a sailing
boat.
The framework is mitered, to prevent endgrain being open to the sea, but
as
these are stepped on they also need to be strong.

I see the altenatives being miters with routed slots for loose tongues, or
mitered mortice and tennons. Anyone have any experience with this type of
work?

A mitered glued edge is not too strong, in my experience. Could it be a
solution to build the framework with whatever strong joints you want and
then cover it with a thin (3mm / 1/8") layer with mitered edges?

Meindert