To use in
40K, or another game? Warlord's stuff is way too small if that is your intent, you'd be better off with 1/28th scale Hobby Boss or Tamiya (both coming in either the same price of cheaper than Warlord's)?
GW's is closer to 1/32nd (a 1/32nd Hanomag is 1/5th thinner than a
GW Chimera, and about 1/4th longer). Oh, but if you're set on 1/56th Rubicon also does an excellent kit with more options than the Warlord one.
As an indication:
GW Predator next to a Warlord Sherman. The Sherman's only slightly thinner than a T-34. A Tiger II is closer in size to the Predator, but still smaller. You'd need a Maus ore Lowe to get anywhere near that size (...and I think they still wouldn't cut it).