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That assembled tall kitchen/whatever hutch I bought for a bargain price had been drilled for the back panel off-square
I had to remove the complete rear panel and square up the hutch by getting the diagonal measurements exactly equal - it took a while to do
Those unassembled units can often be above the purchaser’s experience and/or skills
I recall turning down several people that expected it was a simple fix after gave up or messed up the assembly “assembles in minutes with simple hand tools”
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We put together the one I am using now, they can take some time and lots of crawling around on the floor, lol. My grandaughter said she would do it but I prefer to hire a person who is used to doing it, and I can complain if it isn’t done right later on.
I’m sure you put some work into what you did.
FR is running very slow for me but it could be my computer??