I think the length of 88m of the B'Rel on the "Memory-Beta" is wrong (this wrong size was first mentioned in the book "Starship Spotter, though). The official design length of the "small" Bird of Prey was supposed to be 110m according to various sources. At least in the TOS movies and most DS9 episodes this size seems to fit, in comparison with most of the other ship models.
The size of the larger K'Vort (appearing in most TNG episodes) on the other hand is very controversal, as it sometimes seems to range from around 230m to even around 600m.
But: Great artwork nonetheless!