Hello @Fugari2! Your Frigate is Excelent! It looks great from the Outside and is just as great with it's inside. And no, I got no problems with it's size -- I always liked building small in mass/size simply because I can't or don't have the time to build such behemoths :)
The Best part of this build is it's awesome interior. Great use of Slabs and various blocks/wedges. Just, wow. (Would it be okay if I try/apply this (similar) style on my ships?)
Anyways, System-wise, I can tell that the ship is definitely old (in a good way, it's awesome). I mean, I'm still seeing old blocks here that, I believe, no longer functioning. Like the Jump Drive/Module and the Old Weapon effect systems. You could start improving this ship In terms of performance by completely removing these old blocks. Should give the ship enough space for improved systems, etc. This should also help you improve Your thrusters' Integrity.
Overall, this is a Very Nice ship. :)
As soon as I get time I’ll release an updated version.