The bolts for the cradle are m10's or m12's, I dont remember which. If you send back that RN galvy bit and order a wicked stainless skid plate from slickrock fabrication then the bolts are included.
I would never describe replacing the fuel lines as easy, since they have to be snaked through the chassis, but you're right, now would be the time to do it. ECR's lines are actually made by "Classic Tube" who sells the same stuff for the same price.
Good call on replacing all the soft stuff at once. The fuel pump is probably not a bad idea if its the original, you'll get a fair amount of crap out of it, and you'll have no trouble selling it to someone.