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Yep, it's part of the Gee and Rebecca systems. Not worried at all about leaving out those boxes as I can't see anything anyway!
Work on this project has proceeded slowly. I've decided to fill and rescribe a number of panel lines and hatches on the wings based on the excellent profiles and plans included in the Aviaeology decal set. The hi-res pdf's I received with the order are extremely clear and, knowing where they came from, can be taken as extremely accurate. A revelation to me is the fact that the cannon openings are asymmetrical, something that Tamiya got wrong and that's not easy to fix.
I have decided to leave off the UBC adaptor plates as I have no details of what these look like. However, I will add the eyelets to which these plates were mounted as these feature in many photos.