I'd like to see them too but they are pretty much already in an OTish style.

Having a fighter from the first episode but highly modified would be one side of the same coin as having pristine looking Y-Wings etc in the PT.

The Naboo fighters look the way they do in the first episode because they aren't expected to be actually used at that point.

They are sort of like a constitutional monarch (there largely for show more than anything).

So to have all that polish and colour removed and replaced with exposed guts and flakey paint would bookend the saga and underline that the Rebellion has had to make the best of what they have.

It's subtle storytelling via placed objects (like George used to do in the good old days).