In answer to the OP, we have a seating arrangement on our boat which we find perfect for us.
They can be installed and removed within minutes, painted to match your boat colours and D.I.Y fitted. I will say I have no connection with the person that makes them other than the fact I bought a couple about 3 yrs ago.
As you can see from the images below they work for us.....they are not used often but I like the fact that I can set them up when needed. They are built very well and don't wobble about.
Sometimes we just sit on the roof.....
Seats removed:
I just like this one.....
If you want further info this is where I got them....
KM Joinery
Regards
Mark