This is a surprise one; as expected, the feature banner parts provide the largest bonuses, but we also see here an increased percentage rate for Stargazer (the previous event suit), and the new event shop suit, Delta Plus. Stargazer's parts will be somewhat tricky to build with to maximize your multipliers; the arms are a dual arms and shield part, and there are no weapons. Delta Plus, however, features a full suit, as well as melee weapon, long range weapon, and shield. This one is gonna be where the money is, as weapons and shields do, in fact, add to event multipliers.

This time around, however, we also see bonuses from 1* and 2* parts, albeit at a lesser rate. These parts will all provide you with a 10% bonus to coins per match, per part. So yes, these bonuses are able to be stacked across all three of your gunpla. These listed suits include Jesta (suit parts plus beam rifle) at 2*, along with Jesta Cannon (and beam rifle), and Byarlant Custom. The 1* bonus parts are limited to Dreissen [Unicorn Ver.] (along wit Beam Tomahawk and Giant Bazooka), and the Juaggu [Unicorn Ver.] which doesn't include an associated weapon, much like the Byarlant Custom.

In my opinion, these suits are going to be a way to shore up the difference in losing multipliers by not pulling parts from the featured banners, but at an increased risk in later event stages. A greater bonus can be achieved with less parts by simply buying into the current event suit (Stargazer), and using those parts to obtain Delta Plus parts. Using these additional 15% bonus parts helps maximize a more healthy multiplier bonus across these new stages the fastest, with a smaller investment of coveted EN.