The Nachtigall (Nightingale) is a radar-equipped variant of the Ar-234 jet bomber. It is armed with an underslung pod with two 20mm cannon, holding 200 rounds per gun.
Well, this is what the kit basically is – an armed bomber. So sprue A holds completely uneventluf stuff – common parts like fuselage, horizontal stabilizers, undercarriage, and even recce cameras intended for the bomber.
Sprue B has the wings, engines, and cockpit section – the whole nose is a separate unit to allow for construction of various versions. Each Jumo engine is made up by two halves, an inlet with integrally molded compressor face, and an exhaust “egg” – much similar to the Revell’s Me-262 (or vice-versa?).