Virtual training has been proposed as a controlled, interactive and efficient way to learn new concepts and acquire new skills. Medical training has shown a fast adoption of virtual reality (VR) technologies in several applications. Although progress has been made to reduce the cost of novel and highly immersive hardware tools, the availability of specialized virtual contents to complement conventional training methods is still limited. In this paper, we present preliminary efforts to create an interactive online platform called the "Neuro VR Lab" which contains different activities aiming to recreate well-known neuroscientific concepts and practical experiments. Particularly, this paper covers the development of the Homunculus VR experience, a hands-on interactive laboratory procedure created to illustrate the concept of mechano-perception and brain mapping. Once in pairs, practitioners use a simple cardboard tool to measure the skin sensitivity of their partners in different parts of the body. By registering this data, practitioners are encouraged to use a VR application that allows visualizing their personalized Homunculus in a recreated virtual laboratory. Full-body tracking through the Kinect V2 sensor allows improving the interactivity with the Homunculus avatar by fostering a more embodied experience. Activities are freely available at the Neuro VR Lab website as well as documents with guidelines to carry out the hands-on activities and the executables to run the interactive applications in VR. Our ultimate goal is to facilitate the adoption of these immersive technologies in schools, universities and education institutions by providing free, virtual and highly interactive applications.