LPD-28 & -29 are transitional ships. I am not sure they are worth a large company like Trumpeter investing in. It would be just those two. Better to wait until the first Flight II, LPD-30, is commissioned, and do a kit of that. That will be a class of at least three--probably four--ships, and "many" more if Congress, the Navy and the Marines can resolve the differences which have currently paused the program at LPD-33.

Because there are only two ships of this version, it looks like the realm of resin or 3D print makers, and quite possibly indeed just some supplemental parts to alter a regular LPD-17 class.