I dont really know much about jack shit yet, I'm just on my first aero grow with a shit town of knowledge wedged into my head but my guess would be that is way to shallow...i havnt flowered yet, but in veg alone after like 3 weeks id imagine those roots would be pretty crowded!..also keeping in mind that your drain is right in the middle...youd have to have a good root blocking mechanism to stop it from getting clogged up!..i dig that idea though, pretty smooth, just very shallow...what would you be using as a cover?...i mean looking at it again....maaayyybbeee...but fuck dude, idk...3 inches isn't shit..have you ran hydro or aero before?...i run ab aero set up right now, the ghe rain forest 36 basket and those roots get fucking thick bro..im talkin quick too...im laughing because I'm not qhite sure how I'm goi,g to be able to gently pull my plants out to transfer for them to my larger Dutch pot aero system...i wasted a shit ton of cash on my first real grow system only because i wanted to know hke to do it right before i got to exlieriementing myself...and i would say it was worth it, cause the shit j thought before is out the window!...aero grows like nothing I've seen before...id say give it a try if you don't have anything better to use/and or nothing to waste...i run two 600 aircooled for my mainly flowering tent and a 400 cooltube for my mother/clone room...on top of a 110w blue spectrum tube set up i got for a aeroponic cloner/bubbler...almost overkill..but not really...im running purely for fun, its a hobbie, and from what ibsee already, i have no doubt in my mind that my first harvest will overlap all of my set up costs and then some...however if you neeeeed this shit...tey with like 4 plants...takr it from there...just what i think..
sorry, I'm drinking while reworking my set up and happened to see your post and felt like chiming in!..