I remember the article you are talking about and probably still have it in the Mag Dungeon. The phone was a streamlined model with the receiver that set in the back, behind the dial pad. He removed the receiver, put a Tamiya 1/35 scale Sheridan turret over the dial pad, used some 1/48th scale A-10 engines where the ends of the receiver mounted and painted it a gray and green camo.
I am also working on a hover tank using a couple of serving dishes matted top to top and then have to come up with some top decorations and a turret. I picked up a couple of 1/48 scale tanks (M1A1 and Leopard M2A5) made by a Chinese company. Lousy kits but enough detail for me to work with for a large 1/72nd scale finished project. Just need to figure out how to cut up the turrets and put them back together so no one knows what kits I used :-).
Good luck on your project.