Nice pic of your new tank, ah aquascaping? Yes not fun, sometimes you get lucky but not usually,
I'd say use as little as you can it your display and throw the rest in the sump, I like the look of rock in the display but there's a fine line between getting it to look great and over doing your display with rock, I never leave enough room on my sand for sand dwelling corals,
I was thinking about drilling a hole, just one hole in the rock pieces, on the end if possible and stacking them using Acrylic rods with Acrylic bases if possible and making either one longated structure entertwinded or piles of 3 or 4 rocks stacked, but of course the more room you have in your tank would be better,
Which would mean setting up some sort of large bin with your rock in it in front of your tank and drilling the holes while submerged in the bin and try and be creative in your display all the time pissing off your corals and fish unless you can remove them as well, which could be done quite easy, be patient and you never know you might just do a great job.
I would encourage you to do all this on a day when your better half is away for the day and the kids are in school. And try to have some fun.