On the light tail servos -- I'm using 9411's which weigh 1.3 oz each. I considered 368's at 0.8 oz each but I'm not quite that brave and the servos aren't fast enough.

I don't know whether I'll need nose weight or not. But if I do I'll run pull-pull for the elevators instead. I don't believe in lead poisoning

On the 12 oz cowl, I wonder when manufacturers will begin adding scales at the Q/C reject points? Or even sort on weight? I'd be willing to pay 30% more for the version that met the advertised weight, and I bet there are lots of people who'd prefer that hard balsa durability and would be glad to get it at a lower price.