Mingo, step 1: send in a deposit and reserve your place in line. Step 2: hunt up a used XP and part it down, or plunk down more money on a non-designated custom action. If you go the first route, DO NOT make the mistake of shooting said XP first, as you will convince yourself that you "need" to keep that gun and keep looking for another harvest action. (yep - there's a 35 Rem and a .223 in my safe that were originally destined for this build). If you go the XP route, a stock 7BR or 35 Rem will require less gunsmithing (ie bolt work) to convert to the 7-08 you suggested. Or the smith can open up the bolt face to the proper dimensions. Or you could take any old XP (this one was a Fireball that someone had converted to a 17 Mach IV) and throw a PTG bolt with the correct boltface (.473) in there.

Step 4: save more $$$...once you get one, another is bound to follow.