Its a simple crude build with stuff that were lying around.I just made this after watching a video also posted here somewhere, used the plan from http://www.rcgroups.com/forums/showthread.php?t=1252282 and reduced the size by 30%.

Now what I would like to know is what can be the max AUW for this wing?
Dimensions attached below.(in Cms)

Nice but y did u reduce the size ......except the cardboard frame nothing else is reduced.......equipment is heavy for it + motor seems to be small......what's thrust of motor with which prop.

You shud have taped the c board dude

I just wanted something to fly in very tight spaces, so thought of reducing the size.
Right now the AUW is 220gms approx(yes its a little heavy), Im using 5*3 props right now with 1500mah 2s lipo. Thinking of reducing the battery size or increasing prop size.

The motor can produce

PROP - 6x4 E  200 - 250 gms Thrust
PROP - 7x3.5 SF  300 - 350 gms Thrust
PROP -  8x3.8 SF  650 - 700 gms Thrust

* http://www.rcbazaar.com/products/1944-avionic-m223015-kv1780-micro-brushless-motor.aspx *

@iwincar I was just trying the concept, I will try all the remaining stuff in my next build, have plenty of cardboard around 

To know with some level of certainty, do a glide test on to the softest landing spot you can find. Any calculated values/inferences/results may be torpedoed by imperfections in the craft, which are unavoidable.

http://www.rcindia.org/search2/search=glide+test  (just in case).

1500 mAh seems a bit too much. Also, you shouldn't have reduced the wing area. It'll be difficult to handle in the air. Good try though.

Too bad it doesn't glide much, with all the electronics on there. But CG is correct so it maintains the attitude, but no glide.
Attached a pic illustrating the flight path during glide test.

So either need to loose weight or increase wing span, I guess.Or will over powering help as the motor can put out more thrust with a bigger prop.