Hi Bill;
Not an easy question to answer since I have no idea of how much glue or paint you use when building.
What I can tell you is the weight of the laser cut sheets is 6.8 oz. This includes all of the scrap balsa around the parts so when you consider the leading & trailing edge sheeting plus hardware the model should come in around 8 oz.
The RSM .061 electric power system weighs 8.8 oz. That includes the motor, ESC, KR Flight Manager and 1300 3 cell battery.
I hope this information is of use to you.
Eric Rule