That would bring my 2P combination right where you feel the weight should be. I guess space in the fuse and positioning for correct CG will be the key to it. I have some ply and 2.5 mm carbon sheet is coming from HC so battery tray reinforcement should be an issue.
By the way I like the current draw figures you guys mention. I got lucky and scored some Ino Labs HG-D650HB servos for $34 AUD with free postage. Cheaper then HC for once