Jason the answer is 'Yes' the inflatablle floor will hold the big guy when he jumps from the dock to the bottom of his RIB.
I was 240 in those days, my Hunting partner was nearly 260. The camp must have been 100lbs and the Moose turned out to be 600# or so. (that was the only time I ever loaded the boat that much and if Metzler's are still made, I'd heartily reccomend it as your first choice)
You (**260#) wont have any issues walking around inside the RIB when it's inflated.
If I had to voice a complaint about the inflatable floor, it would be about losing fish hooks down in the crack between the Side Tubes and the Floor tubes.
I had to completely de-flate the boat to get those Hooks.
Also, for de-flating, get a reversable Vacuam cleaner. Maybe they make a re-versable pump by now?
The Metzler was 100 Denier cloth and Hypalon (not sure about the Hypalon) so inflating it was a breeze. It inflated to a certain point. Then the tubes became very Hard and wouldnt take another pound of air.
My boat had a Wood transom all Glued and lapped into the Side and bottom tubes. The Transome had some inflation as well.
The front seat was inflatable, permanantly installed and could be used as a step.
My memory fails on the back seat where I ran the motor from. I think it was inflatable but had a board fixed into it somehow.
The middle seat was a Board that was removable. You could put a whopping big bunch of cargo in that thing.
Rowing it was very easy. I fly fished. I rowed that boat all over Alaska.
The Oarlocks were also glued and lapped into the sides, as were the standoffs for the Safety line. It was a silent boat while rowing.
It was a great haneling boat in the Rivers too.
If your thinking of doing something that exciting with your RIB, pm me and I'll fill you in on some cautions.
The front handle, the bow eye and the two side handles in the rear were all an integral assembly.
My Metzler had some sockets for a Sun shade, something like a Bimini top.
Nawww, I was too rugged to have any kind of sissy shade back in those days.
You have to keep it out of the sun when it's stored. Any good Sun proof cover would be OK for that.
And leaving it out in the Shed during the winter when it froze for several months was probably not good for it either.
I forgot to mention Planing speed. It was about Six mph with two people, the gas n' gear.
With that heavy load I mentiond, it just mushed through the water at a lower speed, so I cut the Rpm's down to match the mush speed and we went 11 miles like that with no other problems.