The two I've built - the Bagnall 0-6-0ST, and the streamlined Fowler 0-4-0 were a bit mixed. The Bagnall was mostly fine, though I seem to remember that the bunker rear sheet was too small and I struggled with the saddletank a bit. Incidentally, the supplied turned brass chimney was too tall (I think it was probably meant for a Jinty), hence the Giesl. The chassis was excellent though, and the self jigging cylinders were very neat.
The Fowler was more difficult, because I realised that the cab couldn't be painted inside as designed, still less glazed since everything ended up as a sealed unit. I reworked the cab rood to make the panel between the rainstrips removable. All the bits fitted, I should say, though the whitemetal fly crank put up a bit of a fight the end result is one of my better efforts. I suspect that it had been designed with 0 gauge in mind - the Simplex certainly was, but dad built that - that's an all wheel drive with Mainline Warship gears. Why Mainline Warship gears? It was the '90s...
There's one other, but I only reworked that. Bob Alderman, who lots of people on here knew, built it. My contribution was to tame the play in the compensation a bit and to put some better gears and pick ups in it - time moves on with these things: when Bob built it, Romford 30:1s were what you could get that fitted!
St Teilo is a 15" Hunslet. The Impetus chimney was naff - somewhere between the stovepipes some had (with mechanical stokers, I think), and a proper Hunslet job - and Mike Edge sold me a replacement from his kit. A very simple loco and, having had it apart, a simple, accurate, kit. This is paintjob number three since I had it, Bob liked the hand lettering, I remember.
Someday there may be some colliery sidings for these to play in, but the Fowler could be at home on Podimore, I suppose.
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....I like the way you're thinking. 
