So my latest game, I got a EW 60 scientist early, so I am thinking of going mesons, but I think I will go with 70% engine commercial engined beam ships, on the theory that versus mesons, you want big cheap systems that are hard to damage. Yeah, they would have huge sensor footprints, but they would be designed to fair well against someone with the same technology. But I am putting a higher priority into turrets than into the individual beam techs, so I will be able to exploit other beam weapons.
I would call something with a 1 month deployment time a planetary defense craft, not a patrol craft. It is designed to be tied to a maintenance base with a population. Well, you have an engineering bay, so it can defend colonies that haven't gotten maintenance bases yet. You might consider a variant without an engineering bay, for just that much more speed performance, but that would limit its deployment options to more vital colonies.
To me, a 'patrol craft' is one that can picket a forward location. Something which can be deployed for a year, preferably multiple years. I suppose it can do its job patrolling a colony pretty well.
I am conflicted about the res 1 sensor. I just don't see you shooting down many missiles without a turret bonus to tracking speed. I build fighter sized meson PDCs to get the benefit of fighter beam fire controls. But it is really hard to stick a turret on a mobile fighter early on. But at least you can clear out buoys with it, and if something does jump on you, you will be able to say what killed you, which is a big part of the job of a patrol ship.
If it is meant more as an anti-ship role than an anti-missile role, it should have a longer, broader resolution sensor.
Odd choice in powerplant size too, but overall, I like it. It has a low rate of fire because you haven't diverted your PP scientist to capacitor research yet, but versus early missiles, the incoming waves are likely to be far enough apart it won't matter, and it is fairly cheap. The nuisance is that it ties up a full-sized shipyard to make them.