, the Tradewind and larger coaches were offered only with the front lounge so far as I have been able to learn. In that era, Airstream did lots of custom work so there may be a handful of '64 Overlanders running around with factory front dinettes, but I have yet to run across one. The '64 Tradewind and larger coaches were equipped with stand-alone drop-leaf dinette tables that added to the versatility of dining - - it is quite simple to move the table out under the awning for an outdoor dining experience.
There are several members who have done the conversion that you are considering, and I am certain that one of them will share their experiences with you.
Good luck with your project!