Its a great little boat. Here's my "naked" set up:
Fully loaded I get 12mph + with the wheels on it.
Water squirts out of that spud pole hole right in front of the cockpit so I gotta go a little slower if there is any chop but for the most part it's a deadly little set up.
And yes, the floor is a little wonky. You feel everything you drive over. In my case, its usually levees and clumps of vegetation. Making a bench seat that spans the opening is a nice addition and it doubles as a back rest support when you are laying out in it.