Hello Ian,
the Austrian company GELI had a F-106 available; scale was 1:33. At the moment this model is out of print, but chances are good that this kit will be published again.
Some links:
A list of all models published by GELI:
Geli: Die Modelle (take a look at number 36)
A list of all models currently available again:
https://www.geli-modellbau.net/galerie/
The F-106 is an not very complicated but really colorful model.
Hope this helps.
Best regards,
Woody