Excellent news! Subscribed.
I'm so glad you're planning mods for this car too. You did some inspirational work on the Echo.
For the rear of the car, I would say you should ideally get a receiver/hitch mount on which to base your work.
When I made
the tail for the Insight, it blocked the lower segment of the two segments on the hatchback, but I didn't miss it as much as I thought I would. On the open road, no problems at all. But it made it somewhat harder when reversing in tight spots. Solution: backup camera.