[kizza42]

Any preference on construction?

In the 3m+ wingspan class you're definitely looking at a composite design unless you sratch build it, shorter wingspan will open up some foam options...

I had the big Hobbyking fox that floated really well, could probably take a bit of weight if it was distributed well.
http://www.hobbyking.com/hobbyking/store...ouse_.html

I like the look of this with a kitbashed motor pod:
http://www.hobbyking.com/hobbyking/store..._ARF_.html
Nice big fat wings, seems like alot of internal volume to play with....

And you can't go past a scale drone for use as a drone
http://www.hobbyking.com/hobbyking/store..._ARF_.html

In terms of out and out glider performance, I reckon you should speak to Mickey T, I'm sure I've seen him wearing a few gliding champion T-shirts

--Edit--
Forgot to mention Austars down in Sadleir, they have a few gliders worth checking out:
http://www.austars-model.com/display.php...C%20glider#