This is actually really hard. There are far too many titles right now, and far too many matches I want to happen. Damn there being too much talent to fit everything on to a reasonably sized card lol.
The biggest problem is the Raw roster and the Universal title, mostly as Lesnar is being saved for Reigns at 'Mania. There are a bunch of top guys who also can't lose to him. Bálor shouldn't be losing yet, Bray needs to be rehabbed, Reigns can't face him, Strowman is happening at Extreme Rules, Ambrose isn't interesting, Rollins shouldn't be sacrificed. That leaves Joe.
I say you do Lesnar vs Joe, with the goal being to make Joe look strong in defeat. Don't sacrifice Joe in the match, make him go toe-to-toe with Lesnar and get a good amount of offence in before being defeated.
The other option I see is doing something like Lesnar vs Bálor vs Rollins or whatever. This is if Lesnar is taking time off and you need to protect him while moving the title to someone else (Lesnar can come back at the Rumble and win the title, and Reigns wins the Rumble. Then they can sign point together).
I like the multi-man option as it means I can have Bálor win a year after his injury, and by pinning Rollins again too. It also lets you headline with your Smackdown match of Nakamura (c) vs Cena (Cena's quest to break the record, a failure). Joe can then face Reigns.
Nakamura (c) vs Cena - World Championship
Lesnar (c) vs Bálor vs Rollins - Universal Championship
Reigns vs Joe
Money in the Bank is an interesting twist on all this. It really would be a great time to have it on the Raw side of things (or ideally on both...) as it lets you cheat the title of Lesnar and go about things a very differently.
As it's on Smackdown, I want it on Styles so I can get him the title whenever I want later. But for Summer slam, I'm having Styles face Orton for it. I want to do an Orton vs Styles match, and this adds some stakes to it. The story being Styles is still being denied his title match, and says he would have beaten Orton for it if he had his rightful chance to do so. Orton disagree, so they fight and Styles ends up taking it off of him.
Orton (b) vs Styles - Money in the Bank briefcase on the line
The mid-card belts get the multi-man treatment, get people on the cards and whatnot. The holders and winners don't really matter as you can go in any direction with them. The actually matches don't really matter either, I just went with the Ladder on Smackdown as there were more guys I liked than on Raw, so it made them easier to fit on the card. There's a lot of room for improvement, but there are lots of titles and little room for non-title programs unfortunately.
The cruiserweights get a singles match, Aries defending against whoever. I'm going with Tozawa 'cos he's awesome, but anyone good can go into that match.
Owens vs Rusev vs Corbin vs Zayn vs Ziggler vs Dillinger - US Championship Six-man Ladder Match
Ambrose vs Crews vs Bray vs Strowman - Intercontinental Championship four-way
Aries vs Tozawa - Cruiserweight Championship
The women are fairly easy to deal with. on the Raw side Bayley vs Sasha is happening, easy to set up. On the Smackdown side I'm going to have Asuka debut and defeat Charlotte for the title. Not sure how to set it up exactly, but it's a surprise opponent. Maybe an injury replacement deal, or adding her to an already existing multi-woman match.
Bayley (c) vs Sasha - Raw Women's Championship
Charlotte (c) vs Askua - Smackdown Women's Championship
Tag teams are annoying once again. Loads of teams, but I want Revival in a normal match so they can do Revival things and win. The Hardys need to be on the card too, so they have to face them. I want heel New Day again, and I want Alpha to win. I'm hoping they can do a 'Clash of Champions' show where they face each other or at Survivor Series. I just want Revival vs Alpha again somehow, and it's easier to do when they're all champions. No clue what I do with all the other tag teams. I'm hoping New Day and heat Alpha back up again, it's a program that should have a long time ago when New Day were really hot as heel champions.
Hardys (c) vs Revival - Tag Team Championship
(heel) New Day (c) vs American Alpha - Smackdown Tag Team Championship
For the final match, I want to do something that Smackdown couldn't do. I want to do Miz vs Angle. Miz is Miz, and Angle gets sick of him, so faces him in a match, and wins! We're setting up Angle to put someone over later, so a win against Miz lets people see him win before he loses later. Angle doesn't have to be built 'cos he's a legend so it's find that he only beats Miz.
Angle vs Miz
Full card:
Nakamura (c) vs Cena - World Championship
Lesnar (c) vs Bálor vs Rollins - Universal Championship
Bayley (c) vs Sasha - Raw Women's Championship
Charlotte (c) vs Askua - Smackdown Women's Championship
Aries vs Tozawa - Cruiserweight Championship
Ambrose vs Crews vs Bray vs Strowman - Intercontinental Championship four-way
Owens vs Rusev vs Corbin vs Zayn vs Ziggler vs Dillinger - US Championship Six-man Ladder Match
Hardys (c) vs Revival - Raw Tag Team Championship
(heel) New Day (c) vs American Alpha - Smackdown Tag Team Championship
Orton (b) vs Styles - Money in the Bank briefcase on the line
Reigns vs Joe
Angle vs Miz