The VC10 K2, K3 and K4 are all 3-point tankers. The K2s were converted from the Standard VC10 whereas the K3 and K4 were both converted from the Super VC10. The K3 and K4 have identical dimensions, but the K4 does not have the additional fuel tanks in what was the passenger cabin and consequently has fewer of the cabin windows "blanked-off". Also, the K4 was never fitted with the crew escape door on the forward left-side. The C1K is the only 2-point tanker and has the same fuselage length as the Standard/K2. It has the Super wing, but with a different wing-fence configuration. Not all C1Ks have the towel-rail HF aerial.
Hi Everyone, I am not a modeller, but occasionally browse this site to admire your work in comparison to the efforts of my childhood. However, I do have first-hand professional knowledge of this aircraft and can offer the following information: The A330 MRTT is derived from the A330-200. This is because the -200 has a centre-wing fuel tank giving 33 tonnes of extra fuel capacity, taking the total to 111 tonnes. The previous comments about -200 dimensions are correct. However, different versions of the MRTT are being built for several customers: 1. The RAAF MRTT is GE CF6 powered and has a refuelling boom, 2 underwing AAR pods and a UAARSI (receptacle) for receiving fuel. 2. The Saudi Air Force has ordered the same version. 3. The UAE Air Force has ordered aircraft as above, but powered by RR Trent engines. 4. The RAF will receive the FSTA version; RR powered, but with no boom or receptacle. Some of the RAF aircraft will have a centreline hose. In addition, the aircraft is competing for the USAF KC-X progamme. The version being offered has underwing pods, boom, fuselage hose, UAARSI and a main deck cargo door on the left hand side. I guess that the version with least number external modifications would be a UK FSTA without the centreline hose. The aircraft does have several blisters for defensive aids and camera systems though. Hope that helps.