Does anyone have any advice or tips to give me as I begin to attempt making car designs on Forza 3? I've made only a few so far, but they were all NASCAR-like and on one of the four stock cars. I'd love to make some cars with game themes, but I still consider myself an amateur at the designing process. Any tips would be appreciated. My problem seems to be that I can visualize a finished design, but am unable to complete the steps to get to a finished product. 
 
I know what I have said may make it hard for people to give me advice, and for that I am sorry. It's hard to explain my troubles, but I believe that I did my best. Any of your guys help is much appreciated. My gamertag is mjwickstrom1. Once I complete some designs I'll put them on my Storefront if anyone wants to check them out. Once again, thanks!

Well that depends on where you are at because some people consider their stuff crap when its really quite good and others think their de vinci with racing lines. Other than that try to combine primitives together to get what you want. You can also use the base color to "erase" (meaning you have red on black so you alter the red by filling in black)  parts of standard stuff make if have a more custom feel to it. Other than that dump a bunch of time into whatever you are doing if you dont need storefront or gifting you can use storefront logos to give your cars more racy feel. Also have fun with it if you find you are getting frustrated take a break and do a race. Hope this kinda helped.

 @Wickstrom:

 I took a few photos as I progressed through a completely ridiculous design in Forza 3. I should have taken more but here's what I did take:

I appreciate your guys input. I will certainly take your thoughts into consideration.

you say that you like making nascar replicas?
 
i think that's a pretty good place to start... the most important things to remember are the details. just do one thing at a time, but don't skimp... for example, stay away from in-game font and in-game logos... especially for nascar replicas. just do one logo at a time, then place them on the car you want to paint. look for detailed source pics so you can tell what every little logo is. if you have any more questions, feel free to ask...
 
btw, here's one of my NASCAR replicas: