From someone who has quite a bit of time in the Cougar, I have to say this is a remarkable piece of work, and much of the detail of this technological dinosaur is craftily represented.
A couple of quick points, in no way criticizing this marvelous model -
1. The speedbrake system is very accurate - forward and aft (flap trailing edge) sections work properly. However, when the flaps were lowered, the fuselage set retracted flush and the aft set faired to become part of the inboard (under the fuselage) flap section to become one singe unit (per side). These fuselage sections are perfectly modeled.
2. The gear system works correctly, with the inboard doors closing after gear extension, an open first on retraction. This was a problem In real life on a heavy weight, high temp takeoff because the drag increase was momentary but noticeable at the first part of gear retraction.
3. The hook was dropped by pulling on the "U" shaped handle (actually took three pulls!). The "stinger button" below the hook handle raised the hook to the horizontal position by the hydraulic snubber under the tailpipe, which also acted as a tailskid (lowered and retracted with the gear), and is accurately modeled by Bob. The stinger position still had the hook point sticking a tailhook length back from the tailpipe but horizontal, and had to be pushed forward into the fully retracted position by a flight deck crew.
4. The two sets of aux air doors on the top of the fuselage served a plenum chamber for the dual faced centrifugal compressor disk of the J-48. These doors were spring loaded and modulated to gradually open in proportion to airflow demand when insufficient flow to the compressor was caused by high power settings and/or low airspeeds.
5. With the flaps down, the horizontal tail was conventional, where the elevator moved and the basic tailplane neutral position was set with elevator trim. When the flaps retracted, the whole tailplane become one "flying tail" unit.
This in no way a criticism, just some technical insight into an airplane that had many strange design features, not the least of which was that it was a typical Grumman tank as far as sturdiness was concerned