I know I am fairly new here, but I am loving it! I did want to mention a cheap alternative! You can buy a couple sheets of posterboard, slap some spray adhesive between the two and use a rolling pin to create a thicker (structurally sound) board. They can be layered to your desired thickness this way! Plus they take a resin coat like a champ!
Just my 2 Cents! Keep up the good work all of you!