Its all good, (some of) the changes need to made.
A lot will be around the seating which we already own.
The towers are already in place and will be wired up today if I don't turn the av tower. There's a couple of reasons I'm thinking twice about that, mainly the amount of the work involved and that I could put the love seat tight to it if left alone.
I was hoping to clean up and hide the cabling, turning it 90 degrees would also mean the lights would possibly be a distraction so it might just have to stay as is.
I'll try plugging the bottom ports next.