Anyone want to make an educated guess on how many FHM are now in my 1/4 acre pond?

I put in 3-1/2 pounds in April (approx. 1000 minnows). They were mostly grown to full grown, many of the males had mature coloring, but some fish were as small as 2' long. I had already established 7 stacks of pallet structures (2 doubles and 5 triple stacks, in 3 to 4 foot of water, the top pallets being 6 to 12" below the surface. When the sun is just right and the water clarity decent, I can see 25 feet out into the pond and there will be a minnow every inch or two (everywhere). Someone here on PB said that I would be able to walk across their backs by the end of the year. I'm almost there. How many FHMs can there be?

AND...Why don't I see any full grown adults at all?, just tons of 1/2" to 2 inchers? I suspect that the adults reside deeper in the pond. If that is the case there is a ba-gillion that I can not see. I hope I don't run out of water.

Fish on!,
Noel