It will be much better if you had the connectors for those PSUs.
Do you have them? It is a board with cables that connects with those psus'. Otherwise, you can use pci brackets from old motherboards.
I made some breakout boards for this supply (DPS-800GB A) If anyone is interested I've got extra parts and can build more. PM me if you are interested. Photos below, the ones I've made so far have turned out really nice. The header on it allows you to also attach it to a Raspberry Pi and monitor and switch it on/off remotely. The other advantage is you don't have to mod the supply at all so it is still in re-sell-able condition.