Step 1- Buy SEI receiver
Step 2-Buy NM parts kit with traditional stock (Heavy wood or McMillan)
Step 3-send kit to be built by a top gunsmith
Step 4-Buy LRB M25 receiver
Step 5-Buy parts kit with JAE stock and expensive optics.
Step 6-Send kit to be built by gunsmith other than the one in step 3
Step 7-Buy 762mm receiver
Step 8-Buy parts kit with SAGE stock
Step 9-Send parts kit to gunsmith other than listed in steps 3 & 6
Step 10-Buy SAI receiver
Step 11-Buy an 18" barrelled parts kit
Step 12-Send parts kit to be assembled by gunsmith other than in steps 3, 6 & 9. Add additional steps with the last step to add additional steps. You will need these steps to add optics, reloading equipment, shooting jackets, spotting scopes, ammo etc....
I hope this was the 12 steps you were looking for...