I just built 2 of the Hypex DIYclassD mono kits. They work perfectly. $1050 shipped CONUS
Used for 30 mins. They were $675 each delivered. They seem to be out of stock now.
The only liberty I took in building them is that I sanded the surfaces down a little on the inside and put thermal grease between the amp and the chassis.
Here is the detail: https://www.diyclassd.com/product/nc400-mono-kit-complete-kit/24
I'm selling because right now I need more channels for the Linkwitz affliction.
This price is firm. I think it is a good deal. I wish somebody had made this offer when I bought them.
I am not the haggling type. If you don't want them at this price, please move on.