I don't know if you'll receive any bonus points for building a display board in Warhammer 40k 8th edition, but I find it's the best way to carry my minis around no matter what edition.
My dragon wing army for my Khorne Daemon Kin is just about finished painting and I'm going to take them to both the Midwest Conquest and Bugeater tournaments. I'm just finishing up my "extra" units that I can summon during the game and once I complete that, I'll snap a few more pics.
The dragon wing army takes up a large footprint so I had to order a large tea tray from Pier One for all of my models to fit. It's roughly 20"x20" and is easily the largest of all of my carrying trays.
Here's how I made it:
I used a lot of rocks from the garden to hold the cork down so it wouldn't bubble while it dried.
I had a cup of coffee while it dried.
Then, it's done!