F-106
Thinking back quite a few years, Darryl Usher used to produce a fiberglass and foam F-106 kit. I don't remember the scale, but it was a very simple, one person manageable size jet.
Memory says it was just about the right size....Had a fiberglass fuselage and a balsa sheeted foam core wing. The late Richard Fong built and flew one back in the day that was featured in RCJI. I always keep an eye open for an Usher kit for sale.
Today's trend is to produce very large (some like me will say overly large) jets that are large enough to require a large trailer and a ground crew to set up and assemble before and after flight.
As far as size is concerned, if it large enough that I can't handle it by myself, I don't want it. I cannot lift my assembled Ultra Bandit by myself, (can't reach aound it) so that size is my personal limit.
Why do you need such a 1/4 or 1/5 F-106?
Make it a manageable size and I will get in line for one.