This study investigates the harmonic response of acoustically functional geometries fabricated via additive manufacturing, with the aim of replicating the vibrational characteristics of natural wood. Utilizing Finite Element Modelling (FEM), various complex structures were designed and analyzed to determine their dynamic behavior under harmonic excitation. The materials under investigation include Nylon12, processed through Selective Laser Sintering (SLS) as a potential substitute for traditional tonewoods in acoustic applications. Emphasis was placed on preserving critical resonance frequencies and frequency response ranges typically associated with wood-based components. The results demonstrate that tailored internal geometries can significantly influence modal behavior, offering a viable pathway toward sustainable and tunable acoustic materials. This research bridges material science and acoustic engineering by proposing an efficient modeling framework for evaluating and optimizing additively manufactured alternatives to wood.