I was thinking a sorta Discount Rescue Ranger.

Upsides
Fires a medium range beam that repairs friendly buildings.

Uses 5 metal per 10 hp repaired (2 damage repaired = 1 metal used)

Beam repairs 20 damage a second

Downsides
The weapon can overheat doing 2 damage and lighting you on fire for less than a second. (overheat is warned by an alarm noise)

The overheat will disable the weapon for 4 seconds and prevent you from switching weapons for 1 and a half seconds.

Does 55% less damage.

The reason I like these stats is I still want to use my shotgun while having the usefulness of the rescue ranger.

These'll certainly change over time based on suggestions and my own changes.