Thanks for a very interesting design @JustinDrake 
Right now MEV-Boost and MEV burn have a first price account with public bids. I’d like to see more analysis of the trade-offs of other auction designs - for example making the auction sealed bid could be desirable because it prevents strategic bidding (builders watching the p2p layer for bids and incrementally bidding higher) and incentivizes builders to bid their true bid value instead. Moreover, we should explore the second-price auctions as well as an alternative to first price. The tradeoff, of course, is that these introduce more implementation complexity.