The 1/6th scale Armortek stuff is very impressive. I've been advising a guy in the UK with his Centurion Mk5/1 build - the basic kit then 'super detailed' to produce a scale model of a particular Australian tank as it was configured in South Vietnam in 1969.
If you are into models it is worth a look .....
http://www.armortek.co.uk/Forum3b/vi...4b79e8c#p51767
Armortek also produce a 1/6th 25-pdr under their Kompact Kit label. It's the closest to a 1:1 25-pdr that I'll ever have!
Mike