I am shooting a Garand, I'll look for the book you refrenced from the NRA. I found what seems to be a pretty good link on the web for inexpensive accurizing at the Garand Collectors page:
http://www.garandcollector.org/Articles/accuracy.htm
One of the Masters at my monthly match showed me the trick with the lead filled copper pipes held in with springs in the buttstock. I just got a Creedmore jacket for Xmas, very nice, I really feel "locked-in" using it. I also got a shooting glove, but I'm not comfortable with it yet.
I'll email you if I can get the targets and ask your input for the rules/details of the match, I like your idea about no jacket, slings, or spotting scopes. It will make it more inviting for those without all the gear.
Time and resources permitting maybe follow up with a blackpowder match.
When you shoot standing,use a stool to rest the rifle butt between shots since your shooting 20. A really good scope is supposed to be the Meade 90 spotter scope. It's supposed to let the user see .22 holes at ridiculous ranges. The problem is that eye pieces that come with it aren't sized for 200 yards. At 100 and a .30 cal., you can use just about anything.
The target can be anything. In fact you should be able to find a good 100 yard target anywhere. We don't need that bed sheet size now that we shooting rifles.
If you need practice for the wind, go to shooterready.com