Cabinet conundrum

I built a nearly 20-foot-long cabinet/bench for the Florida room. I built it in three sections. Up until now I was kind of at a loss as to how to install it in the room.The challenge is that I have to scribe three edges onto walls, as well as to prime and paint everything. An added bonus would be to have all of the tops actually match up 100%.I was going round and round as to how to accomplish this. I kept on getting hung up on how to register pieces with each other.As I was getting into the shower after mowing my lawn I got the idea: use the Domino!All I have to do is register the pieces on the bottom face and I'll be able to flatten things out with a sander and re-mount everything to scribe and paint.I fricking love the Domino machine from Festool!