I wish I had had the option to buy a 5U enclosure, but I am happy with the 4U I just bought.
You can see progress on my project at GitHub - kolotyluk/home-lab: Home Laboratory
It is still a work in progress, especially the README, as I only recently got things running, but I am having fun with it.
Don’t reply here, but see Custom Build With Supermicro H13SSL-NT - #3 by ekolotyluk