I haven't seen this style in single chimney form ? Have they done it, in non-limited edition format ?
Its a trade off of either a repaint, very expensive conversion or an incorrect top.
That said if doing as preserved, theres no escaping that huge mechanical lubricator (I read somewhere is off 7027) added sometime in the last 5 years on the left side, and the PKP air pump on the right side, air pipes, electric pipes on the loco and the storage / gsmr boxes on the tender).
ignoring some other details (pipes, handrails, steam pipes etc), as part of this thread, http://www.rmweb.co.uk/community/index.php?/topic/92697-Hornby-castle-class-differences/ and just focussed on the chimney / cylinders, for the newly tooled versions of the castle, Ive looked over:
4073 Caerphilly Castle - R3237 Single Chimney, curved sides, wrong livery (Great Western 3500gl tender)
5011 Tintagel Castle - R2848 Single Chimney, curved sides, wrong livery (Great Western Collett tender)
5043 Earl of Mount Edgecumbe - R3301 Double Chimney, Stepped top (BR early / Hawksworth Tender)
5053 Earl Cairns - R2822 Single chimney, flat top (BR early / Hawksworth Tender)
5068 Beverston Castle - R2849 Single Chiney, flat top (BR early / Collett Tender)
5075 Wellington - R3105 Single chimney, flat top, wrong livery ( GW / Hawksworth Tender)
7007 Great Western - R2958 Single Chimney, stepped top (Appears Correct loco body version ) but is a very rare limited edition, would need a GW crest removing off the splasher. (BR Early / Hawksworth Tender)
7023 Penrice Castle - R3118 Double Chimney, Stepped top (BR Late / Collett Tender)
7029 Clun Castle - R2994XS Double Chimney, Stepped top (BR Late / Collett Tender), DCC Sound.
7034 Ince Castle - R2850 Double Chimney, Stepped top (BR Late / Collett Tender),
7036 Taunton Castle - R2986 Freeman Duchy set Single chimney, flat top (BR early / Collett Tender)
7037 Swindon - R2852 Single Chimney, stepped top (BR Late / Collett Tender), would need a GW crest removing off the splasher - appears to be the best one to use but is a very rare limited edition.
as for suitability, ranking would be (inc cab handrails, pipes and cab windows).
1. 7037 - correct style body, & tender, remove a crest (but this prototype could cost you over £200 notes !)
2. 7007 - correct style body, & tender, remove a crest (but this prototype is also over £150 notes !)
3. 5053 / 5068 / 7036 - almost correct body
and for tenders:
1. 7037 - correct style body, & tender, remove a crest (but this prototype could cost you over £200 notes !)
2. 7023, 7034 or 7029 (note 7029 is a sound tender).
My conversion cost: £80 for Penrice Castle, £20 for 5053 body, £10+ change for Fox Nameplates and sold the redundant Penrice body for £25.
to come of course is Hornbys 5051 R3454 Dryswyllyn Castle, but who knows how that will appear, but the artwork suggests Single Chimney, curved sides, wrong livery (GWR Collett tender but correct handrails)
I am thinking my Tintagel Castle might become 4079 at some point.