Very nice. As you say, Mouth of the Dragon really only needs minimal changes. The Romeo boats and earlier LCMs have pretty much the same firepower, the monitors are similar with a turret gun that is more focused on bunker penetration than volume of fire, it’s mostly the ASPBs that need replacing with much slower and less capable EAs/LVTPs. The main difference, of course, is, as shown in your pics, the use of much bigger LCIs in the Dinassaut and LCTs on bigger ops.
What size are your river tiles? I need to build some myself and I’ll be caging all the good ideas out there. 😉