Only watchouts of note are checking for frame warpage, good to correct it early if possible, and the depth/thickness of the window glass. This happened in the Starliner as well.

It will interfere with the fit of the assembled interior/chassis unit, do some dry test fitting first and clearance with a sanding drum on a dremel.

The fierce looking nose of the 300 is perfectly rendered, especially the front bumper. I have the PE grille for the next build down the road...