The gun ammo was compact but how big do you think the missle was?
You might want to go with a 105 main gun as I believe that was a cosideration.
You could also stick the 152 gun in the A1 turret as this was one of the first proposal for the system, althought the turret was modified somewhat.
Get the Hunnicutt book on the Patton for alot of details on the A2.
Steve--good point on the refernce material. I am going to start a trend to see if anyone has the titles of all the Hunnicut books.