DIY setup I made. Any advice?

I made this setup with stuff from walmart except for the lights I'm gonna use. I plan on never moving the reservoir just draining it and refilling. Any tips on something that I could do better? Also I have a scrog inside the box but I couldn't upload any more pics for some reason. And my box is 3L x 1.5W x 3.3H . I have an inline fan and carbon filter too just haven't set it up yet. And I did calculate cfm

you could have a larger base. i predict that will not stay upright til harvest...