Great looking tank, can't wait to get fish and coral in mine. Just starting to cycle it, I have the 850. The Frag rack, you'll have to cut it down. If you are getting the ReefMat, it takes up a little more space than you think. Also you'll have to cut the flexible pipe down a lot, and the black support that goes with the filter socks, will get in the way of the ReefMat. Atleast on the 850 it does. Do you have the print files for the parts you printed? Also make sure that you have leak tested the sump. I leak tested and moved it just a tad on mine, and had a leak.
Yes you can find my post also on the red sea FB group. If you PM me your email address I can send you to STL. I'm probably going to print a bunch out for people too