The tree bases fit into hole that I cut in some masonite board. These form the outer edges of the forest area. These are nice and sturdy and the tree fit nicely back into place.
This style of woods will be very handy for the new 40K 5th edition. The new edition does away with area terrain and instead uses a direct line of sight method. This means each tree's location is critical.
Only one more to finish before the GT on Saturday.