Crazyboy335, here is a reason you SHOULD NOT avoid SimDetailGrafx.
A reason why you shouldn't avoid SimDetailGrafx is that the site's owner, Craig / John is a creator of many Bullring mod bases! I usually go there to download bases for my cars. I recently created a couple of cars with bases from SimDetailGrafx.
So, DON'T AVOID SimDetailGrafx / NASCARDesignGrafx!!!!