The cockpit detail is better on the Hasegawa than the Tamiya. There are literally hundreds of after market accessories made for the Mustang in all scales. Most common are resin cockpits, wheels, flaps and of course the early tail. There are also photo-etched brass detail sets for cockpit and various other parts. A great place to look for these accessories is at UltraCast Decals are a challenge.
All kits come with decals.
Although, often they re thick, out of scale and of poor quality. The main aftermarket decal companies that produced 357th FG decals are Aeromaster , Superscale , and a few other companies that put out an occasional Mustang sheet. There is one last option on decals, and that is to make your own. It is our hope to be able to develop a set of 357th FG code letters and numbers in the correct font for free download to anyone who would like to use them to build a 357th FG mustang. Markings will be a challenge.