Welcome to the forums. Looks like a decent plan.
One thing you might want to check before you get too far planning the details is whether you have enough clearance to change out a tire. The low hanging skirts and tight looking wheel well might not provide enough pull space or articulation. Perhaps you can do a cardboard mock-up of that area, or get some input from others with similar style builds on the same trailer. Better to know before you get too far.