Turned out nice,just remember with patience your skill level will get better and Welcome to the forum!they're lots of modelers here to offer advice and tips.
I agree,I have really cut back the last couple years I tend to shop around to see where I can find the best deal,luckily the last few years Round2 and Revell have been reissuing kits I already have so I've saved quite a bit of money there.
i'm not aware of anybody casting them,you would probably have to go through the auction site and pay a arm and a leg or maybe the interior from AMT's 68 RR or 69 GTX could be modified to work.
Headlights look very realistic,have you ever given any thought in making the lights operational on any of your builds?you have a keen eye for sweating the details.