I updated the mirror and added custom campaign tile sizes for version 1.4 of the framework. I hope you're fine with the design change? Live tiles might cause trouble in that menu, as it is designed to showcase the order of missions in a campaign.
Viewing post in HITMAN 3 Mod Framework incl. Offline Content comments
Yes, both is possible with ModStoryTileSize in contract json. Modders can now customize how their campaigns should look.
I already added tall tiles to elusives but forgot to upload. Will fix soon.
For escalations I think different tile sizes are nice to get blocks that only contain one escalation each, but it is your mod so feel free to change it however you like.