The only way to keep weight down will be to keep it short. I think it is safe to assume that this knife will be similar to a sirupati in weight at the same given lengths. My 20 inch Sirupati is quite controllable for it's intended use of power chops or slices. A knife that heavy as a thrusting weapon may be too heavy, maybe. I dont have a 15 inch sirupati on hand, but figure that it is not much different in heft to the BAS, so this range may be it.
Tom, I think that you, your friend, Rusty, and Suttcliff will need to decide on a length for keeping the weight down. Anything over 20 inches is going to feel like a broad sword and be slow and heavy in the thrusting mode.
If you guys go for a 15 incher or less, I may go for one, especially if it comes with the khukuri style horn handle. Over 15 inches in my opinion and you get to heavy for a stabbing type weapon which needs to be lighter. Although a big 20+ incher sounds scary looking.
Bill, if this continues, you may need to take a head count after the final decision since, these will not be khukuri's and may not sell if not previously agreed to be purchased. IMHO