Yes, James (I think) drew our attention to this a few weeks ago - and to the fact that it's not a Mk IV, but a Mk V, perhaps with some incorrect details. I think it lacks that little line of rivets running vertically on the front face of the sponson, below the 6pr opening. Mk IVs didn't have it, but the V did.
I was looking through a copy of "Britain at War" magazine yesterday (article on tank banks, issue 76, August 2013) and saw an ad for some display of Armortek tanks at the Tank Museum on 28 September, if that interests anyone - though whether the WW1 tank will feature, I know not.
It will be a beast to lug and it may be best for those wishing to motorise and transport their MkV to carry ramps to drive the beast in and out of their vehicle:O)
Armourtek try and use protoypical materials where possible and I assume the plate used for construction will be thicker than true scale for rigidity purposes, thus it will not be light weight!