Yes, Eluga A3 does have a gyroscope sensor.
Yes, Panasonic Eluga A3 is a metal body phone.
Panasonice Eluga A3 comes with 5.2 Inch HD IPS display with 1280 x 720 resolution which produces 282 PPI resolution. It has Asahi Dragontrail Glass which provides protection against scratches etc.
Eluga A3 does have 3GB LPDDR3 RAM.
You can use one micro and one nano sized sim card in Eluga A3.