Finally I have completed my version of an Imperial Corvette. This is certainly not a scratchbuild but a minor modification of an existing model (Revell's Republic Star Destroyer). It has the classic wedge shape of the Imperial Star Destroyer. All I have done is add a large bridge structure, add larger weapons and a lighting system. The weapons are either gun turrets or missile launchers and are mounted with magnets to allow rotation. Blue LEDs are used in the main engines with fibre optic tubing for the smaller ports. There is a red LED in the bridge to give it a "red alert" feel. Certainly the first model I have done with lighting but I think it turned out fine.
Still thinking of a name, possibly a Vanguard class Corvette. Something like a Vigil but with better command facilities.