New Walker Type

The recent uncovering of bullet-proof walkers impeding the Piercing trait got me thinking about an idea for another walker type. It might be fun to go up against walkers who are significantly resistant to fire. Not sure if it’d be more straight forward to have them reduce the likelihood of Incendiary activating (maybe 10% instead of 50%?), or reducing fire damage each turn (maybe 2% instead of 10%). They could even look like armoured walkers but dressed like firefighters. Maybe for extra fun all attacks against them could be non-bodyshots. So next to no fire, no crippling (with the exception of one or two weapons inflicting guaranteed Cripple with charge attacks) and no charge points for Sasha

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Comments
The reverse of bullet proof is what we need. Perhaps walkers level 55 and above will always get built in body shots, maybe 50% or so.
Unless they change completely the whole mechanics, mixing up fire with bodyshots will make several maps (or even most) unsolvable. It's like 2 things happening at once: they are more resistant to fire, and then they are immune to cripple.
Like Shian's idea of burning Lucille
How about walkers that can’t be crippled/rooted/stunned but have guaranteed non body shots? Lots of potential for variety here.
It might be cool if a status-immune walker first appeared on a map after a threat count. So melee means maybe you get one or two of them, but noisy guns means you get nine! And you’d really want to clear as much of the map as possible before having to deal with the status resistant spawn. They could have half the health of regular walkers and still probably be a problem