That's what I thought - however the narrow ones have a higher length to span ratio than Vipers, and the flat one originally had a turret and was designed as a very flat-hulled hover-tank. Once I removed the turret the Cylon fighter sprang to mind, and I see it's not just me
I'm afraid I have no idea where these are from.
I bought a pile of troops and vehicles from a very generous chap (and a brilliant painter) on the Lead Adventures Forum, who sent me a small collection of 6mm resin buildings and these vehicles extra at no cost. Although someone on the sale thread mentioned the range, these three models are not part of it, and are unidentified - which is a pity, as they're quite nice designs.
In the meantime - the thread is called Utter Chaos because it will include:
old school Chaos
more modern Chaos
weird conversions
space marines who have turned to chaos taking their stuff along (the Red Corsairs list will be useful here)
traitor guard
dark mechanicum
stuff from other ranges such as these
In other words, one big mess.
Currently working on Chaos bikers (I'm actually using disc riders
; whilst I do have bikers, I had started painting the Disc riders some weeks back, and now - just for once - I intend to finish these; and they're growing on me.
And four Slaanesh demon knights -the old blisters had 3, NET EA Red Corsairs need four, so the fourth is of course converted....