I'd say something like a 110 with sharper handling (heavier and moderately worse wingloading, but slightly better powerloading, flaps the same area as the 110's, leading edge slats), and stronger guns. The 6x20mm package speaks for itself... The MK103s will probably be cumbersome, but I expect that their hitting power (~95% the NS-37's, x2 guns) and ballistics (dunno about dispersion, but fly as straight as 50cal/hispanos) make up for it. So for A2A, it should characteristically be something like the 152 - constrained agility leaving not much room for error, but jackpot anytime you can work out a solution. Compared to the general trend we know right now between Luftwaffe, RAF, and US fighters, it should fit right in.
The BK5 is pretty much a one-shot kill on anything that flies, at the cost of two tons of gun+ammo. No idea about the dispersion HTC will model, but given that it's a ~1shot/sec gun and that it's got a pretty huge kinetic energy (~10 times the average AH cannon, twice the NS-37's) for a muzzle velocity about the same as 50cal/Hispanos, it should be fairly flat and most accurate. By comparison, the 25H's 75mm has twice the kinetic energy but only 2/3s the muzzle velocity. The BK5 should fly at least as far as the NS37 (~1.5-2K).. Hopefully as far as the Ostie's round - it has less kinetic E and muzzle velocity than the NS-37 but is allowed to fly 3K out or so.
Accessorily, the 410 has see-thru cockpit on the lighter gun packages (2 separate sections gradually covered as muzzle flash increases.. see the pics up-thread), dive brakes, and visibility should be about as good as the 110's. It has rear guns, but those are probably at least as ineffective as the 110's. It looks like there's a see-through pane of glass separating the bomb bay (right in the nose) and cockpit floor.. I don't know whether that'll be modeled, and if HTC will model the substantial instabilities of flying with that open. It would make for a really big exploit for lead shots.