This ship size is probably the best balance between firepower, defense and agility. Larger is hard to afford sometimes and too slow to stand much of a chance without large turrets, and smaller ships do not have the firepower necessary to make a dent.
I like the functional performance combined with excellent design on this ship. The level of detail is perfect.
A minor point of constructive criticism: a well designed ship like this deserves better engines than the usual 1-deep layer of ice crystals. Adding more depth-based thruster exhausts would be the icing on the cake.
Bonus points for proper shipyarding (with product line(s) and constant revisions).