I began working on the main wing again today and decided to cut the two  1m CF tube spars in two and just stick a bamboo barbeque stick in  between, like so:

Bad idea.. this means that the load and wing twisting stress will be focused on the contact points of the bamboo spar and the CF tube which can mean disaster.

At this point i couldnt really revert to using the whole CF spar as the halves are already well glued to the wing. The only option therefore is to just join the wings together permanently and charge this to experience.. $%@$!.

Still about 75% complete.. the main wings now weigh about 320g.. it will most probably weigh about 450g eventually which means I have less than 100g to complete the fuselage.  Doesnt look too good, at this rate the plane will probably weigh 1kg empty =S