Actually, in this concept, radiators may be the reason it feels archaic and fragile to me.
A while ago, on the old forums, someone (IIRC, he was a specialist in thermodynamics) suggested having heat management in Infinity. After some thinking, it struck me as the single most brilliant idea ever proposed on said forums. It would bring an easy to grasp, but more original and potentially far deeper mechanism in resource management than simply ammo/energy ones.
Possibilities include, but are not limited to, heat-sinks or coolant fluids that you can throw away, heating a ship to impair it (stun mechanics), trade-of between stealth and cooling (radiations), between heat and vulnerability (exposed cooling systems), better cooling in atmosphere, ejecting heat-sinks as decoy flares so running hot is actually an advantage for fighters… Maybe I should re-create a topic about it.
The point is, I did a bit of research and if you want to be even slightly more realistic than Star Wars or Galaxy Express 999, the most conservative numbers ask for such a radiator to glow blue at temperatures with nearly 5 digits. Note that it would definitely look cool (Oh god, pun definitely not intended), but it shouldn’t look like a piece of metal one expect to find in their 90’s computer. When tungsten would explosively vaporise, you need something somehow high-tech-looking.
In fact, IIRC, to have even remotely believable external radiators to really help (assuming the hull already radiates normally), you need them to be the size of sails. It would bring interesting gameplay - deploy them only if you’re safe, or they will be torn apart by the first volley, but it asks for more art, code and balance.
tl;dr : To bring things back to those radiators, they would look old even by today’s standard (still used, but out there for decades). They are also for immobile things in the air, not fast-moving crafts and definitely not for spaceships.
Especially not for spaceships that may want to go close to a star and would have to make sure it’s never facing said star.
So it would look very incongruous on an Infinity spaceship.
Other than that, as the fragile look is intentional, it does looks great. I’d expect it to be a cheap, light fighter, that can’t take a hit and may be a bit tricky to master, particularly in atmosphere, but can still pack quite a punch.