I think this item should be a weapon and the stats should be this.
+ (using rc pad) send it to hover in a location (by pointing and clicking that location)
+ recall button on rc pad ( right clicking the rc pad would make the heli come back to you and hover around you)
+ fast as scout
+ less metal cost
+15 max health on wearer
+5% faster turning speed
+ large ammo capacity
- slower build time
- 1 level
- 10% slower firing speed
- 5% less damage
- replaces sentry gun
- when hovering around you, -5% damage , -5% turning speed (recall mode)
So the engi would take his rc pad and where ever he points and clicks the heli goes to. This item would be good for clearing a sector or just defending buildings or sentries (i know that valve makes the stats but i just wanted to share my thoughts).