Though not a correct puzzle answer, used the 8 + 1 units to form this design. I am saying +1 because the center-unit varies in the dots (5X5) with other units(4X4). Center small square is free hand enlcosing the center dot.
Dot grid 13 X 13 or 13 dots - 7 lines and reduce in steps till 7.
Thanks Rajammaji, waiting for the next puzzle 
