World of Tweed
and a stiff back. Had an hour on one of those seats and never willingly again.
The "Asians" went one better some years ago in removing the bulkhead between the cabin and rear cargo hold to install two more rows of seats in several new aircraft. Not an approved mod certainly, but accepted.
How cheap do you want to go ?
As far as the thin seat is concerned, has it been tested or lumped into the original spec?