Daves option sounds like a good plan. Hopefully they are at least queen size so you can do that. You may also be able to extend the berth a bit more inboard and rotate the mattress and add some shelving/storage alongside where the mattress doesn't reach the wall anymore. You may lose a little standing space in the cabin
. Any things possible though. Our berths are accessible one side and one end and I works fine for either of us. The side is slightly easier to swing and put your feet down rather than sitting and sliding to the end.
We have around 5' of headroom
between the berth and the ceiling. The berths I don't particularly like the look of are the inboard ones with only one side accessible and very little clearance to the ceiling, sometimes only 2-3'. They look claustrophobic and hot to me, especially for the inboard person. Also often they are very high off the cabin sole
with inadequate steps to reach, like cutouts in plywood
(ouch). Often they're seen in cats where the comfort is less important than the performance, so it's a trade
off as always. Narrow hulls might be too narrow to allow a low wide berth, high bridgedeck clearance and low windage might mean minimal headroom
from mattress to ceiling, and maybe a thinner mattress
Also important is adequate ventilation. A deck hatch
over the berth allows for good ventilation usually, as well as a fan for windless nights. If positioned well it's also good for watching the stars. Opening forewards is good for the breeze, but will also wake you whenever it rains and will result in a wetter berth when you forget to close the hatch
while ashore or underway ..