Hi!!! I had to replace a complete floor on a 93 Dicovery side console 16'. It was over a thousand rivets and I purchased the new ribs from the company. What I'm getting at is, that boat had the triangular (and straight ones too) so I know how they go in. When I removed all the ribs, stringers and supports, I noticed that the markings were on the wall of the boat for the center seat. It wasnt removed just never installed. The boat did have a front bench seat and a rear bench seat to keep the hull integrity. So I think you should only remove the middle seat otherwise the hull would be too flimsy. Even though mine had the front and rear seats it still had three or four braces (triangles) one each wall. I had a 3/4" thick piece of marine ply that was covered with that marine floor covering, lying on the front seat and the front triangle "seat". This was my front platform. The rear of the platform did not extend past the rear edge of the front seat. In the center of the platform I made a door with a stainless steel piano hinge. This allowed me to utilize the space in front of the front seat for my 6 gal. gas tank and the life preservers. I had a small square mike crate at the very front of the platform (bow) to hold my anchor and chain. It was a very nice setup.