using rock in Hügelkultur beds

The flower beds surrounding the house were full of landscaping rock, that I have spent the last couple of years removing and replacing with wood chips.  But I have a huge pile of this rock to get rid of.  I have tried giving it away, and here is sits.  The rocks range in size from a quarter, to tennis ball.

I have decided to finally cut down some trees in my back yard and use the wood to make three 10‘x4’ Hügelkultur beds.  The trees need to come down, they cast the back yard in almost complete shade.
Would I be making a mistake by digging a foot deeper and spreading the rock evenly at the bottom of the three beds, then placing the wood?

I know it can cause some drainage, but enough to warrant not doing it?

Some Hugels are built with rocks at the bottom southern edge to heat up and stretch the growing zone. I don't have experience with this but have read it several times. As well rocks are used to capture moisture in arid locations. It maybe a waste to bury the rocks and more work for you.

I love rock piles.  Lots of little creatures live in them, bask on them, hide from bigger creatures in them...  If I was close to you, I would take all of them.

Maybe post them to Craigslist or the like?

Putting them in the bottom of the pit seems like it might undermine the water retention goals of the mound. I'm with Trace though, rock piles on the surface are awesome. In my Mediterranean climate rocks piled around the base of perennials and trees can pull moisture out of the dry air and keep soil moisture up. They can house the kind of critters that tend to eat pests like slugs and grasshoppers, and they seem to be able to stabilize soil surface temperature.

What kind of soil do you have?     Heavy clay?  loam?  Sandy?

What kind of rocks are they?  Granite?   Sandstone?  Rocks that are alkaline?  (Do the vinegar test.)  They would be a long-term source of whatever minerals are in them, and it's better not to mess with the pH of the soil if they are highly alkaline.

Rock paths are very helpful, especially if you line the soil with old shade cloth or weed blocker fabric, and then put the rock.  The fabric helps keep it from disappearing into the soil.