That pilot looks sound M. Little tip on figure conversion if you don't mind me offering advice. Try to avoid using heat, as, unlike 'conventional' moulded parts, figures often have 'semi-hollow' limbs, which WILL deform, as you found out! It's always better to gauge what you want, then make 'strategic cuts', which can then be moulded-in with the ever-helpful Milliput.
Good idea for the Japanese groundrcrew, should work OK. Have a look at that Tamiya kit the next time you're in the LHS; the figures can be used for most situations, and altered as required, as Ii think I paid £7.99 at Model Hobbies for the one that's in my stash, and I'll be getting a couple more.
Anyhow, I think your Corsair, pilot and ground crew will look great when it's all together. Looking forward to the pics mate.