Kurt,
Said #4s, maybe I'm thinking of the forward ports....You're correct, more like #10s.
In an attempt to reuse the frames, I thru-drilled and countersunk the exterior frame for #10s.
A338's ports and frames however, are/were aluminum and the tapped sockets for s.s. machine screws were all corroded.
Probably because Pearson didn't use a barrier on the threads.
You are heroic - remodeling the footwell/bridge-deck....
But you are doing this, as I understand it, to gain head room for horizontal sleeping.
Howzit going to work? Isn't it a bit high up for a bunk?
Can't visualize a bunk over the galley area.
Is the arrangement athwartship ? Not. So it has to extend forenaft into the cabin....
Has to fold or disassemble quickly.
Mon, you don't happen to have a sketch you can post here?
I'm also one of those long people that don't fit in buses and airplanes, and economy cars....and MORCs.
All's fair in taking OP's ideas in boat remodeling. so, give it up!