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Hello!
This is a pretty late update, but I figured I owed it to you all for the brainstorming you helped me with! The wedding was in July in MN and was an extremely hot day, but I'm happy to report that all cakes made it to the venue (in four separate cars) and nothing was damaged or melted!
I don't have any good gut shots of the sliced cakes, but these were possibly the most symmetrical and even cakes ive ever made. I'm incredibly pleased with the results. I also made Manhattan cocktail inspired macarons, which I somehow have no final photos of.
4 of the 5 cakes used the same vanilla sponge recipe. The only one that was different on that front was the carrot cake.
Cake 1: chocolate orange cake (the flavor I struggled the most with). I landed on a chocolate French buttercream and orange curd. I spiked the curd with a little citric acid to make it less sweet. This honestly was still my least favorite cake but seemed to be everyone else's favorite, so this is probably a me-problem. Also, the decision to make the French buttercream was somewhat driven by the extreme number of egg yolks I had leftover after making a crap ton of SMBC. I also have literally nearly a gallon of the chocolate frosting in my freezer now. ETA: I also added dark chocolate shavings on the chocolate layers.
Cake 2: strawberry honey. Strawberry honey jam layered with cream cheese honey buttercream
Cake 3: lemon blueberry: lemon curd and blueberry jam
Cake 4: lime blackberry: lime curd and blackberry jam
Cake 5: carrot cake with brown butter cream cheese frosting
Macarons: chocolate shells, Russian white chocolate butter cream, cherry compote with bitters and orange zest
All the cakes were covered on the outside with Claire Saffitz's invented cream cheese SMBC, which I highly recommend everyone try. It's worth the work. Carrot cake was also Claire's recipe, as was the chocolate French buttercream.
I put the cakes onto 1/4" plexiglass rounds that exactly fit into the cake boxes I got, so no sliding around. The logistics of transport was potentially over the top, but it was an hour drive and I was paranoid. Thus I had three other guests pick up one cake each the night before so 4 of the 5 cakes had a lap to sit on and would be protected. The fifth sat at my feet (with one on my lap...it was a lot of cake). I gave everyone the dimensions of the box ahead of time so they could make room in the fridge and gave clear (written, lol) instructions on how to carry and hold the cakes to prevent sides from squishing or body heat melting the base. Also these things were HEAVY. The scale pic is in kg, not pounds. Big shout out to my transport people, because it was a lot of pressure. I should probably mention that I'm a trained scientist and also project manager, so there was really no escaping this being project managed to death. I also kept the equivalent to a lab notebook as I recipe tested and scaled recipes. I copied the entire notebook and typed up final versions of each component and gave that to the couple as a gift. Now they can make their own 1 yr anniversary cake!
That's about all I can think of. I'm really proud of this but also underestimated the amount of work. I took 2 days off work to assemble the things and it took about 1.5 workdays to get it done. All the components were made ahead of time aside from one extra batch of SMBC, since I ran out. So this was literally only assembly time. I will not be doing this for anyone ever again. Oh also we bought an entire additional fridge for this. Good news is that we now have a backup fridge in our basement.
Big thanks to this community for chatting me through some thought experiments to pull this off. 💗