You've found a great site, and a great source of valuable information for the next 5 years of Derby racing.
My boys bridged over to Boy Scouts last year, and I learned most of what helped us succeed in the Derby here on this site. Great people and great information.
And good for you for volunteering to be their Den Leader! I was my twins Den Leader for 5 years, and while it was demanding at times, I wouldn't trade the experience for anything.
Use the Search feature on this site, and you'll be building blazing fast cars with your son in no time.
Scrollsawer