WOW. I know the Lindberg kit well and what you did with it is nothing short of amazing. Many of those early jets modeled by Lindberg were more or less the prototype aircraft like the A4, F100, F-8, F-7 , F11F1, and the F104. The rivets were huge and the detail lacking. I have several of the old Lindberg kits for nostalgia reasons as I would not spend the time and effort to build them given todays products available. The "Scooter" is a great old bird and I, like you, have build many of the various versions, but have not considered the early test models until now. Your model is an inspiration. Thank you.
The early A4 would qualify as a "light aircraft" by the FAA as it weighed less than 12000 pounds. IIRC it weighed about 8000 pounds empty. It is an amazing little aircraft and is still in service (Brazil, U.S. Navy -"Top Gun"?) since it began production in about 1953/54. Again, a great build.