Nssis-class Clawcraft were often associated in the public imagination with the Chiss Expansionary Defense Force, but although the basic term "clawcraft" would appear to be a Chiss one, and fighters so described were used as trainers by cadets at Chiss military academies as early as 19 ABY, there is no direct evidence that these ships incorporated the TIE technology of the Nssis-class.
A Chiss Clawcraft.
In fact, the design lineage and operational history of the classic Clawcraft connects the type far more closely with the forces loyal to Grand Admiral Thrawn. Part of the confusion stems from the fact that Thrawn's Household Phalanx was largely staffed by Chiss personnelóbut this unit was a "rogue phalanx" operating independently of the CEDF, commanded by Imperial General Soontir Fel, and operated alongside the stormtroopers and line military units of the Empire of the Hand.
By 19 ABY, pilots from the Household Phalanx were using long-range scout vessels combining TIE cockpits and drives with alien technology in a manner that bear an obvious similarity to the Clawcraft, and it is known that the Empire of the Hand was using some form of Clawcraft as combat fighters by 22 ABY, at which point the Chiss Ascendancy was still apparently refusing to adapt non-Chiss technology.
The Nssis-class was revealed to the wider galaxy in 26 ABY, when three squadrons of Chiss pilots from the Household Phalanx fought at Garqi and Ithor. A part of this force continued to fight alongside Rogue Squadron until at least the battle of Kalarba, and after the fall of Coruscant, a wing-pair of Household Phalanx Clawcraft were sent back to scout by Baron Fel, joined later by several squadrons of combat pilots, who fought alongside the Galactic Federation of Free Alliances until the end of the war.
A few Nssis-class ships were seen in Chiss space in 29 ABY, by which time unknown political developments in the Unknown Regions had led to Baron Fel becoming Assistant Syndic of the CEDF; but it was not until the clashes with the Killik Colony in 36 ABY and 38 ABY that the familiar Clawcraft categorically appeared in large numbers in CEDF forces.
THe cockpit section could do with more color-cordination and stream-lining. The wings seem to depart be too far from the fusalodge and hte cannons could also stand for some improvements. I'd also advise you to credit Steve V. (if you did indeed use his design as wing reference). It's a neighborly kind of a thing to do. Overall, not a bad build. It certainly blasts my Clawcraft to shrapnel.