I don't bother with seatstay length, bar width, crank length really. Well maybe bar width when I get a used bike and wonder what size they are. All the cranks I've had have the size stamped on them.

I also measure BB drop thusly : Loosen QRs, run string along top of axles, measure distance from center of crank bolt to string, subtract 5mm (assuming 10mm axles).