Looks nice. I just a few days ago watched a Veitnam history from 196, and what really stuck out to me was how dirty the F-100s looked. So this modeller's portrayal is spot on.
Looks good, but some reservations about the way the weathering has been done. I know they got dirty, but this appears a tad too false. Still nicely done overall, and probably looks better in 'real life' - lighting and cameras can give some rather harsh results.
Not my cup of tea and not sure about the gap T but you can certainly still see the join lines all the way down from the cockpit roof all the way through the cargo bay. I also think it may still be the original white plastic unpainted.