It is planned to modify the superconducting continuous-wave 130 MeV electron accelerator under construction at the Nuclear Physics Institute of the Technische Hochschule Darmstadt in order to supply an electron beam suitable for FEL experiments. The accelerator consists of an electrostatic preacceleration, superconducting injector and main linac and two recirculating beamlines. The FEL project is planned with the electron beam of the first recirculation in an energy range from 35 to 50 MeV, corresponding to wavelengths from 4.9 to 2.4 μm. In order to achieve higher peak currents, the present design of the injector has to be changed. This redesign, the modifications of the beam transport system of the first recirculation and a preliminary hybrid wiggler design will be presented.