Is anyone familiar with a boat of the above type that has been
retrofitted with posts/beams, or something comparable, to provide
additional intermittent support for enhanced offshore cruising safety ?

That is, the boat was fit with some kind of supports and/or connecting
members to permit temporary installation for offshore work.

It seems to me that this might also include provisions for also
temporarily installing bulkheads for compartment isolation and flotation
installation.

All this might be desirable for the seldom made cruise but cumbersome
and undesirable for the boat's normal usage.

Thank you,
Courtney