Arca has a built in permanent nav table opposite the galley.  There is a  quarterberth behind the nav table

Note the Bridgedeck!  Awkward getting in and out in a big sea - but a good safety feature if there is any danger of being pooped

There is an opening coachroof behind the  mast and liferaft cradle.  Also the 3 circular ports - not usual H28 forward windows.