Pankaj
1. see Image 0069, why do you need such a thick fuse aft of were the wing is attached to the fuse, it will increase wt and drag,
2. There are two very very basic principles that you must bear in mind while making a glider (a) Area Ruling (b) Reflex Camber
For both of these see my posts in the basic AD Thread and take the discussion to the that thread for larger good of posterity
3. Polyhedral has a lot of interference drag at the point of dihedral change, in fact if not made properly it can cause unnecessary roll and yaw. however it's lateral stability will be good and will behave very docile.
this build of yours should rather be a stepping stone something better in the future.