So I finally completed the Exotic Orange Cake!
Here is it, I'm so pleased with how it came out. I took it to work to hand out samples and the reviews were great! As Patrick had mentionned, the vanilla cremeux (which I remade after the bitter version that I wrote about earlier, and this time it was very nice.) is not too sweet at all. I didn't modify the recipe to sweeten it up, as I wanted to taste it first to see, and I'm glad I didn't. The majority of the comments I received were that the cake wasn't too sweet, and that they liked it like that. I couldn't find passionfruit puree anywhere, so I just used mango puree for the gelle layer, and maybe this balanced better with the non sweet cremeux as it didn't have the tart edge of the passionfruit.
I didn't add the white chocolate spray either, but will have to look into how I make some sort of spray tool for that. I have a vague recollection of us doing some sort of class with spray bottles and chocolate/cocoa butter mix in school.