These are some really great projects. I was going to do something similar this season, but other projects and opportunities got in the way. My PVC won't go to waste. It will be used for garden "hoop houses" later this fall -- unless some other opportunity comes along. Actually, I did add some structure with some left over PVC and some plastic "chicken fencing." That was back in March. It didn't take long for them to become fish magnets.
We put in some new ponds this spring, which with left us with some big stumps. I added about a dozen big stumps to the main pond right after the bluegill and bass spawned. Within minutes of dropping these things in the water, they were saturated with with fish of all sizes and denominations. Typically, we placed three side-by-side, with a few feet of distance between each stump. They were placed in water, at full pool, that is about 4-foot deep, and real close to spawning grounds. I don't have a pictures, but we also put some 6 to to 8-foot lengths of 10-inch PVC pipe between/under some of the stumps for the catfish to have some "spring break" fun.
A friend also brought his excavator over pull out some stumps on the back side of the main pond, and to do a final positioning of the stumps we dumped in earlier as the new hiding places for fish.
So far, so good. The main pond is producing extremely well this season.
We lost a lot of fish and had a completely unbalanced pond as of about 14 months ago. This spring, we had a gazillion YOY bluegill and bass. Through fertilizing and daily feeding to satiation, we now have a gazillion 6-8 inch bluegill, and not quite as many 6-10 inch bass.
I don't know whether it was due to unauthorized poaching of big bass, too many big winter trout, a chemical imbalance due to some pond cleanup during the previous late summer, or a winter die-off. But last season was dismal.
We are still catching a number of trophy size bluegill in the 10-12 inch range. Most go right back in. Tonight, while feeding, I saw at least a dozen channel cats that need to come out, as they are all at least 24 inches, and a couple may be over 30 inches. Last week I took out several LMBs in the 17-21 inch category. I've never added feed trained bass, but each of these were full of pellets.
Structure may make it a little more difficult to fish, but it sure improves the fishery. As I've recently posted elsewhere, I've been using a fly rod a lot recently, because it lets me get into the structure where a spinning or bait-casting setup never would.