If you need to have a go at making one then these sort of reviews will help you put together some ideas of making one yourself. The retention mechanism needs work but you need to start somewhere. Heres the link Welldone Rob Need a workshop
Its a nice simple but effect design, which would look a killer with a nice polish (me shallow and into pretty shiny look). Have a read of this article. www.overclockers.com/articles511/ What it says is that water flows in linear layers. This means that on a block this style you are only using a few mm of water to cool your cpu. If however you soldier a few bits of copper wire to the base as pins they will increase surface area and create the turbulance to increase the cooling effect.
good first block...maybe some turbulance inside would be good all the water is doing is going in one hole and right out the other next to it...i would be suprise if it wuz even on the far side of the block if the system wuznt filled to capacity...but still a good duron 600 block