SA9 I hate to say this but,.... that one looks like a cross between the DY series from TOS and the Raven from Voyager. Still a nice ship though.
The one The DC was asking about is this one
Well, you have a good eye. The ship Spaceagent-9 depicted was actually designed by the same person who created the DY-100. It was a kit planned to be sold for a series sponsored by the company, AMT, that was producing the Star Trek kits in the series and expected to be the laugh of a different series of kits. They had in mind an original space opera storyline that would promote the sale of this and other planned kits, including a little shuttle that rose from a central shuttle bay [also a brilliant Jefferies deign) These plans never evolved for several reasons, including how poorly developed the storyline was.
Called the Leif Ericson, if I recall (I may have the spelling wrong!), it was designed by Matt Jefferies; a brilliant visionary who also created the original NCC-1701 Enterprise. Jefferies was not a typical futurist, he was a creative design er who was well schooled in aviation technology and aerospace science. He originally was commissioned for its design for the promotion of a series of models, since the Star Trek Series had a limited number of designs for AMT; the company who owned the rights to sell Trek plastic kits. What he did was to use some early concept drawings from star Trek designs, as he had felt the look was clever and futuristic, even if Roddenberry had rejected its inclusion as a starship. The design was almost included in Star Trek the Animated Series but never made it past planning stages of storyboarding. I can't remember which episode I was told it had bene planned for use.
Never the less, the design is strongly linked to Star Trek, even though it never appeared in an episode. This is partly because the designer was common to the series and the kit, but more often because anyone growing up in the 60s-70s who built Star Trek model kits produced by AMT was familiar with its image, as it appeared in promotional material and on the side of Star Trek kits. It was produced as an Interplanetary UFO vessel, later, after the Leif Ericsson series flopped, and made into a well remembered a glow in the dark kit. If you built those early Trek models, it was always sandwiched into those promotional pictures of other kits available in the Star Trek line...even though it wasn't ever officially Star Trek material.
Its use in the fan made film Lolani was a love letter to its history and association with Star Trek fandom, as well as a nod to Matt Jefferies. He loved nautical designs and foresaw a future where vessels would have hulls not dissimilar, whether in space of at sea. His vision of space vessels, when advanced, would not be the current zeitgeist of heavy grebes along the hulls, but of smooth surfaces where sensitive equipment would be contained behind protective ceramic and ploy-mix protective coatings. Ships designed to enter, or skim, atmospheres would have more integrity if they didn't have obstructions that would encourage atmosphere drag and create hull heating.
Its a artistic approach not currently favored in Sci-Fi but it makes a lot of sense in advanced technology. Why expose vulnerable equipment to radiations or other hazards unless the equipment, like sensor domes, were needed to project the efficacy of the technology? Never the less, just as smooth saucer shapes once dominated the creative expectations of viewers, not heavy detailing chases this younger imaginations. It will likely swing back around again as our technology changes.
By the way; the images that Spaceagent-9 shared are actually modifications of the original Ericson-design. The original ship had no engines at the end of the wing-foils [see below].
Its a beautiful ship, I agree, and though not ever actually a Star Trek ship, it is a part of plastic modeling history, and a sidebar to Trek fandom.
By the way; nice image of the Orion Interceptor. Is that the Eaglemoss version? I don't have that one. That's the ship I suggested, but I can see why the Ericson/UFO has merit too.