Custom Tank Modification: Harley-Davidson to Chopper Fit. For this custom chopper build, we helped our client achieve a bespoke look without the high cost of a “from-scratch” fabrication. Rather than commissioning a fully custom unit, the customer sourced a Harley-Davidson tank with a similar profile. We then expertly modified the existing shell to ensure a perfect, seamless fit for his specific frame, delivering a high-end result within a more efficient budget.