As I mentioned before, one thing that really detracts from an opened-up large-scale Spitfire is a bell-shaped interior cross-section.
There are ways to correct it, since Hasegawa only did a partial job on its Mk V and Revell never saw fit to do so on its 1/32 classic.
The best (or least worst) way (above photo) is to lay in your bulkheads and upper stringer and longeron detail and then cut to fit a couple of pieces of .010 sheet styrene for the space between the two bulkheads pictured above and for the space aft of those bulkheads. Pre-curl each section as part of the fitting.
