[Redcanuck]

Here are some visual references:

Nose/engine mount http://www.spitfiresite.com/reference/va...nts-01.htm

Fuselage
http://www.spitfiresite.com/reference/va...nts-02.htm

Wings/Tails
http://www.spitfiresite.com/reference/va...nts-03.htm

Some nice picts of early Mk IX Spit plastic models including a 4 Cannon variant
http://www.cmrmodels.co.uk/cmr-175/super..._conv.html