After this delay or another,,
Have finally started on the Raven's Hatch construction...

Routed the sides down 3/8 " for the weather stripping

Used template to draw off hatch ribs, using 1/2 " baltic birch for all ribs, two side ribs will be doubled, then rough cutting ribs for the hatch with saber saw..
The first set of ribs I fabricated were out of 3/4" ply, warped and twisted badly, before I could get the hatch built, because of a major delay... So decided on using Baltic birch to build my hatch. A lot easier to work with, cut and rout..
Notice : the thickness of the ribs in the middle area, I added this area to the ribs to help prevent spring back when the skin is applied..

After rough cutting the baltic birch ribs with saber saw, attached the template and used a flush router bit to rout the ribs to exact size..

Clamping ribs to sides with 1/4" spacers

Double 3/4" oak for cabin hinge header, 3/4" oak with 3/4" Popular for the hinge to mount on hatch, left 5/16" gap for the hurricane hinge

Positioning center ribs for gluing, nailing and screws
Notice : the thickness of the ribs in the middle area, I added this area to the ribs to help prevent spring back when the skin is applied..


I'm using 3/4" x 1 1/2" struts between the ribs, will glue, nail or screw where I can, and add extra glue blocks for added stability...
Building the hatch in place seems like the easy way to do it. once completed it should work very easy and keep the same gap on both sides of the hatch between the walls. so far I am very pleased with the way it is turning out..