I have sailed monohulls, and you do not want to rake your mast perpendicular to the boat on a H-16.
The 16 will pitch pole and will not get up wind very well without considerable mast rake. Most folks get their mast "In the Ball Park" by taking a measurement with their halyard, with the main up and hooked. Pull your halyard to the center of the bridle wire boat on either hull, mark where it hits the halyard, then walk to the stern, your mark should fall 11-14 hash marks below the bottom of your stern. Once you get your mast to this point, you can rake forward or back a little to get your boat to handle right for your wind conditions, crew weight, and sailing style.
David