I think your wasting your time trying to 'arrange' 38 cars in that spot by colour/model/special, just too many to even think about an arrangement, IMHO, and it's not a massive area to play with.
The best you could do is have a front line that follows the grass line/verge then do whatever fits behind. Manybe and inverse arc of the front line at the back, then infill with whatevers left and the Gazeebo.
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