help with a CLONING SYSTEM please

i have 4 clones that have rooted are should be put into rockwool and put into a hydroponic system.... i have an nft system with a 400W HPS light that is in a 12/12 cycle now for another 5 weeks or so...

my question is what is the easiest and good 'at home' built hydroponic system that i can easily make for my clones until they can be put into the nft system after the harvest.

i'm open to easy make shift ideas with ebb and flow, drip systems, or any other styles of hydroponics. i just need to make a "temporary" place for them to be able to grow but be in different cycle. don't want to spend for another system... thank you to anyone who responds.