Well, I put her all together to get a rough estimate of where the balance point would end up. I was afraid it would balance quite tail-heavy as I went with the carbon fiber spinner and wing tube. Well, it ended up at 3" back from the leading edge at the wingtips!!! I am slightly nose heavy! That is a good thing, because when I put on the SuperGear Carbon Fiber landing gear that will allow me to put the batteries on the servo tray next to the receiver and in front of the rudder servo in the middle hole, with no weight added to the nose...so I get to keep my 15-1/2 pounds without adding balast.-/

I think the biggest factor in being able to use a CF spinner and keep my batteries back on the tray by the RX is the CF Stab Tube from Troy Built Models. I'll get a more accurate CG measurement with everything bolted and strapped down and see where I stand. I would like to get the CG back to 3-1/4" to 3-3/8" per SilverSurfer's suggestion for a perfect flying model. I can't wait to find out what that feels like.

Edit: I found that I had entered parts and sub-assemblies in the computer when I was adding up the weight! The total weight (no fuel) for the 28% Extra 300LX is an amazing 15.4 pounds!!!