The Jenny B (a 2005) was ordered in late 2004 and the only reason we didn''t get a floor model 2004 was because there weren't any in the Admiral's color choice, namely Mocha.
We spent a lot of time in the 2004's while ordering and the only difference I could see visually between the 2004 and 2005 was the "Barber Chair" forward facing seat option which included the two piece table top that was part of the forward facing seat mod.
I have only a brief view of the 2006, and one change I saw was the method the table was attached to the hull. My 2005 table would pop out of it's holding brackets if I leaned on a corner. The 2006 table was locked in better so I asked for and got a kit from the factory to "upgrade" the mount. The other change involved the fuel tanks. Later 2005 and 2006 had somewhat larger tanks and a better method of cosmetically covering and mounting the tank. My 2005 and earlier had a cover and tank mount that used all screws, including screwing into the deck! Later 2005 on had a mount that was fiberglassed into the deck and the cover screwed to it.
Don