Ok there appears to be a few things i would be doing quite differently.
1: it can't go very far. 2 months. i usually deck my ships out to handle about 1.5 years. needs moar fuels.
2: Its going to explode. See the annual failure rate? stuff goes wrong every year, and if a few of your big ticket items break down, the whole ship could start to crumble and explode. Add some engineering spaces to get that est time up to, oh, 2 years should be more than plenty for ion ships.
3: i don't see a reactor-- theres no power for the guns to shoot anything, unless im blind and sleepy.
4: 1 shield unit is not going to help-- I usually do five for a small ship like this.
For a beam ship, the speed is good-- you want more engines on a beam ship to help close gaps while they shoot missiles at you.
My first ships that i designed like this were not very successful. i'd take the active sensors off and run a dedicated sensor ship-- great big arrays to give some serious range-- 60 m km is not very far at 4km/s.
I make a sensor ship of about 6600 tons that is a huge missle sensor and a huge ship scanner, and put some passives on there. Deck it out with armor and shields because those active sensors make it a target. Then, your PD\Beam ships can defend it with incoming missiles.