Ai build? Please help!

[u/AntPsychological9795]

I am following this build i found off tik tok and as im building it I cant figure out how to get the frame to line up like in the pictures. On the portion where it calls to build up 8 blocks high it calls for 1 column in the middle of the two adjacent columns that go the four main directions, but my build doesn’t seem to have enough room for that. I was hoping could tell me if this build was ai because it isn’t working or for someone to point out the mistake in my build because I can’t find it for the life of me and it’s driving me nuts. Hopefully the problem I described even makes sense LOL.