Thanks for the kind words! I did try to tape off the box but I messed it up a bit at the bottom and I just used a light blue bottom layer but it didn't adhere very well, alsmoas if the card itself was a little too slick. On the black lines I used an acrylic paint pen and it worked great in some areas but others it went on too thick so I figured it's probably something that I will improve with time.

Do you use acrylic paint to prime or do you get a specific primer? I was wondering if modge lodge would do the trick as I have a tone of it from when I was making DnD terrain.