Nice pictures are always helpful to us visual learners. :): Rather than 4X8, I made 3 parallel beds, each 5X30. The longer beds fit my property nicely and it sure is easy to rip right through with the tiller.
I'd go with the 2x10 or deeper. I did my original with 2x6 cedar and wish it was a little deeper. Also, consider pea gravel in the walk way between beds as mulch tends to get spongy after a rain.
The 50:50 soil manure mix is ok, but Tiffanies Mulch sells what they call "planters...
I think some of you considering home school or who have already made the leap will want to consider the upcoming home school convention. It will be held May31st and June 1st at the state fair grounds. More info on the web-site Indiana Association of Home Educators (IAHE)
Wow - what a huge step. I guess that goes to show the magnitude of the problem out East. Moving a family and a business is non-trivial. I'm very curious as to the reasons you selected Indiana, over say Idaho. I think some comments would be instructive to all us native Hoosiers.
BTW...
That web page is just a template. Its the same pictures for shooting ranges in CA and NY, just different numbers. No real information on the actual range. Check this out: premiershootingrange.com Directory