8 gallon food storage containers with the lids (the 13 gallons create a 50-55 gallon system, i hate res changes now)
3 inch current culture bulkheads
A 1000 gallon per hr pump (doesn't have to be this strong)
And you are good.
Ive always made my own systems but i recently paid 3k for about 10k(retail value) worth of shit and a 12 pod C.C system was one of the things included, I just wanted the dual port AC and 3 RIO 720 Grower choice lights the guy was selling . I haven't used the system yet to compare but the only difference I noticed is the buckets have a drop off in them that allows u to drain that extra 5-10% of water. The plastic is stiffer than the food storage containers but I have never had a leak with them. (last pic shows the drop off). I wouldn't go out and buy the system when I can make one for under 500(850 including a 1/10th chiller).The system doesn't even come with a chiller for that price. Its a simple build, plenty of videos on it
If you use 5 gallon buckets tho I would recommend using two 1inch bulk heads attachments so your first buckets doesn't over flow and so you are at less risk of root blockage