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Hey BC I'm sure You've done your research but just in case or for anyone thats interested



Looking at the pic and the old models it almost looks like a across between and powerfist and a power claw, I'd be temped to do the orky thing and make my own if you can't find what your looking for since Yarrick looted it from an ork anyway

Maybe one of these
http://www.ebay.co.uk/itm/FORGEWORLD-LEGION-Mark-II-2-III-3-RIGHT-HAND-POWER-FIST-Bits-40K-/401071341076?hash=item5d61b6fe14:g:SxkAAOSwe-FU8cff
http://www.ebay.co.uk/itm/40K-Space-Marines-Assault-Squad-Power-Fist-Arm-/321721791629?hash=item4ae81cf48d:g:0o4AAOSwBahVKI41

combined with one of these?
http://megabitzshop.com/index.php?a=1613

or just plasticard


I've been looking into warboss bodies as part of one of many projects that I'll never get round to some which are interesting are but all require conversion work
Rat Ogres
Dire Troll Mauler
AOBR Warboss
Kromlech Mecha-Armour
GW Ghaz Model
Demon Prince (I find the waist very small)
Mordor or Cave Troll

Theres also a expanded Ghaz model here with a similar pose to the artwork which might help you picture what that model might look like.
http://40kwip.blogspot.co.uk/2011/03/ghazghkull-thraka-conversion-5.html