Thanks guys 
Seems like you all agree with the basic design of the THANLOS walkers.
Lets see if I can maintain that trend 
I decided to name the two walkers Pollux and Castor - the two brothers from Greek mythology.
http://en.wikipedia.org/wiki/Castor_and_Pollux
First thing was to build POLLUX's carapace, using the same template as for CASTOR.
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With some of the lessons learned on the first built, it went together quite smooth.
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While the carapace cured I started the "close combat" weapon for CASTOR.
Its a huge sword.
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Do we have something like this in the WH40K arsenal?
A huge power blade?
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I think it looks good 
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CASTOR with the sword and the left arm that will take the long range weapon (maybe a Bolter?) and POLLUX with his carapace.
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POLLUX's close combat weapon will be a huge fist with a flamethrower in the palm 
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Fingers attached.
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and the arm mounted (with quick tac).
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What do you think?
What should be the ranged weapons for POLLUX and CASTOR?
Thanks
Klaus