Welcome to Planted tank!
Your build looks great, I am looking forward to seeing it progress!
What style of background are you going with?
Its going to be a build up of artificial rocks made or expanding foam with lots of mosses.
I do plan to heavily plant it so only a few bits will peak through.
I will be making planters myself using the expanding foam and balloons with some drainage holes. This is the plan now but things may change or not work out as i hope.
Looking forward to bringing it all together.