blueprinting question for builders....

I was measuring my rods last night and have a few questions. how close do they need to be, for one.....mine are all within .8 gram

and then...i made up a jig for measuring the big end, and they are all within .8 grams. I can then assume, that since i measured all the big ends exactly the same way that the small ends are also within a gram, right?

after I file the rings I can use weights of the pistons and bearings to keep everything equal, right (like the lightest pistons with the heaviest rods)???

then...does the machine shop need to know the weights by big end/small end (rotating/reciprocating), or just the total rod, bearing, piston, pin, and ring weight?