Hi Kailas,
It is a nice plane. You are so lucky to find an unbuilt one 
As I know full scale sailplanes use floating system, but most of the models are still using the old spar system. I think the floating system may have its merit, but not so significant to make all the others change to it.
I think the advantage of the floating system are
1, The wings and the spar carry the load. The force acting on the fuselage by the wing is actually not as large as one might think. The fixing pins are enough to hold the wings on the fuselage. There is no need to fix the spar on the fuselage.
2, Fixing the spar makes alignment job difficult because we must make sure all the 3 parts (front and rear pins, and the spar) are well aligned.
3, Save the work in fitting the spar on the fuselage.
Anyone can suggest other advantage ?
In theory it makes sense to use the floating spar system: The pins set the wing incidence and the spar carry the load. It is easy to set up (for full size) and there is no redundance in functions. But I think these are not so important in our toy aeroplanes than in the full size. On the other hand, a fixed spar on the fuselage can also secure the wings by friction, while floating spar need something extra to lock the wings. In King's photos, the little device in front of the spar is the wing lock. (Your kit does not have this wing lock. It is not a standard item in Akrostar)
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