i'm gonna guess and say those holes are for your ventilation.... well it will work as far as ventilation is concerned, but i would have moved one to a side opposite the other and towards the bottom (floor), this would give more of a breeze effect if you will. As far as the hole thing, yeah, that should work fine, you might have to raise the whole thing up towards the end, but then i never grew the lowryders so i'm not 100% on how tall. As far as the number, again, that is something someone who is familiar with that strain can answer, i would guess that you would need a bigger medium, but like i said, i havent grown that strain so i dont know..... In theory, if you had clones that were rooted, one could flower in that..... so for being stoned when all was made and prolly thought of, not bad....