ORIGINAL: jamieduff1981
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Pica: Undercarriage too far apart, and uses completely wrong geometry, folding straight out in front of the main spar instead of folding rearwards with rake and pintle on the retract units. It's also built from 1/4" balsa sheet sides so it's flat sided in section and not eliptical sectioned as per the real thing. The overall outline isn't too bad apparently, but the nose is too long by almost an inch which spoils the proportions a bit and I believe it has a flat belly too.
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You are probably referring to the 1/6 PICA Spitfire. The 1/5 scale Spit, although still "sport scale", has a better undercarriage geometry and looks the part when finished. The most obvious departure from true scale is the omission of the rather characteristic "gull wing" in the rear centre section of the wing. This is a pet peeve of Spitfire aficionados, but most people won't notice. The Yellow Aircraft Spitfire also has this deviation from scale. Unfortunately the PICA range of kits are not produced anymore.
As always, in the end it is down to the skills of the builder whether or not any of the kits mentioned in theis thread will result in a convincing scale model of the Spitfire. IMHO the Brian Taylor Spitfire plans are still the ones to beat as far as scale accuracy is concerned.