Yes dave kiffs have the rim cut as part of the reamer.

I used a finish reamer to do the whole job. A roughing reamer is only necessary if you are going to do a lot of chambers as it saves wear on the finish reamer. For our amateur purposes a finish alone is all we need.
Give the reamer to the barrel maker/machine shop, get them to chamber it until the rim cutter just touches the breach end of the barrel and stop. Then assemble and smoke down the barrels and then do the rim cut and final chambering by hand which will also govern the final headspace.

I have RCBS dies and they perform quite well enough. I do use other more expensive dies for long range/high volume calibers, but for this they are great. They came from Huntingtons as did the cases.

As to the weight of your finished rifle mine weighs 11 1/4 lbs finished.

If you go to one of the US barrel makers web sites they have weights of barrels in various contours which may help approximate the weight of your finished gun.

Regards