I would pay the extra to have it assembled...NOT EASY! But it is a very organized one of a kind item Im happy I purchased and worth the work. must have patience to adjust each and every screw (which means disassembling what you have assembled over and over and over) until “the puzzle” of every screw lines up perfectly to be assembled tightly! Im guessing the pre drilled holes are all too deep so you will have to unscrew each one incremintally until “that” screw fits the housing hardware provided and by the time you get 4 or 5 screws perfect some other ones have come out of line and have to be re calebrated so...i have patience and even I almost  stomped it to pieces and called it a day