I noticed that a few of the models i used were not true to scale so i spent a couple of hours arranging all ships i have top-down images of into proper scale to each other and with their canon lengths. I have even saved a version with my calculations and room for more ships. I will not go above ImpStar sized though as that will make the smaller ships single-digit pixels sized.

This also works as a Imperial Warlord fleet builder: You have 3000 points to spend, length (rounded to closest 50 for odd numbers) equals point cost of one ship of that class. Have at it.