Filling in the "T"
Not an Ericson... but another well-designed / built cruiser-racer that I sometimes get to sail on has a T-shape cockpit, and like several Ericsons (and Olsons) came standard with a tiller (with a wheel optional). It is a Yamaha 33, if you are curious.
Note that this particular boat has a factory set of teak slatted seats that lock into an aluminum channel across the back and have two slide bolts to secure the fronts. Each end rests on teak cleats.
Full length seats for lounging and sleeping -- and loads of cockpit room for happy hour when the tiller is vertical.
Anyone could make some similar fill pieces if they have the tiller version of the Ericson/Olson.
If your boat has the wheel, you really need the width around the side of the wheel for access.
I do not know if this moves the discussion along, or misses the original point (!).
Oh well, more ideas can't hurt....
Loren