FYII would try to not modify the sump if you can avoid it. Just use the different compartments as they are and it will work great.
For the plumbing, you won't have a lot of choice but to modify some of it since it's metric and convert it over to imperial plumbing if you are in the states.
The tank and stand are great and high quality, no complaints there.
The drain is super loud, I would put gate or ball valves on both returns and dial them in as needed to reduce noise.
Outside of that, very happy with the purchase!
Stay away from a Macro Algae reactor and don't convert to a filter roller if you want to save yourself a huge headache Just go lowtech with filter socks and a small fuge. Will save you a huge hassle and changing socks every 5 days is honestly not bad, I find it less annoying than using the Clarisea (though I can go 2 months without having to change it which is nice)!
Good luck and make a build thread!
I am having good luck with my Tunze. It doesn’t spin but as you can see below it grows well. I do have to supplement some carbon dosing as I have a very heavy bio load. Keeps nitrates below 5 and Phosphates below 0.06.
It fits well and easy to maintain.