UPDATE
well, the chain i bought is 5/16, i think zakk uses 9. so the weight isnt an issue. i've been using the thing on my FirstAct for a while now, and it feels good. takes a lil getin used to.
i figured out how to mark the cavities. i went to www.jacksonguitars.com and got a pic of the RR3. took some measurements (1st-12th, etc.), and figured out that the pic is a 8.16:1 to the real thing. used that for body size, and cavity markings.
got the front trem cavity routed. I HIGHLY RECOMMEND A BIT WITH A GUIDE BEARING!!! i took a small chunk out of my template, b/c i didn't spend the extra 30-40 $$ for a bearing (my bits didnt have any). i got the front cavity routed to 1-1/8", like stewmac said to. goin to get the back cavity sometime in the next couple days.
buying a disposible camera or two today, and my mom has a scanner. pix comin soon!!
Also, Crafty, i decided on 21 frets b/c i don't want to have to move the neck p-up. i'm worried that will mess everything up tone-wise, and to tell the truth, im still somewhat technically illiterate. BTW, what is so much harder about a front rout? the only really tough thing will be drilling holes for wires, but the dad of this girl i work with is going to wire it, so i dont need to learn to solder just yet. YAY