WvWvW- Engineer Build
Could give a flamethrower build a shot. Maybe rifle with battering ram, med kit, 2 elixirs (could drop one of the elixirs for goggles stun breaker). Flamethrower won’t really do that well against the zerg – better for skirmishes. Rifle would work when there’s the usual standoff and people are just poking and prodding – could work in small skirmishes if you can stay back and let a tankier person take the hits.
Just search this forum for some flamethrower builds. Here’s the rifle build I had in mind – http://www.guildhead.com/skill-calc#McMM9mmnrgMmnGgM0xx0amszVRso
For gear I’d go knight’s (power, prec, tough).
Reliable Excavation Demolition [RED]
Human Engineer of Anvil Rock
I would consider only ft build if you do not want grenades. I find it much usefull especially when you are not fighting on a siege. You can make quite good amount of damage to a lot people, most of the time it hits more people than a grenader can. During sieges you are as usefull as a grenader, you can flame the door, keep them burn during gate bottleneck fights.
Power prec toughness build is very much suitable for ft, I agree with mario.
I would suggest 30firearms, 30 alchemy for juggernaut and HGH then use this with more might coming from elixir B, you stack a lot of might, you can be a dps engineer as high as it can be for this profession. Also you will have decent amount of toughness and elixir traits which will give you a very nice tanky build.
The only downside is short range but the fun aspect of using ft covers for that.