What isn't apparent here but will be in cross-section is that the cabin takes up a bit more than the upper two thirds of the craft's height. The total interior space will be similar to that of the Class F shuttlecraft. Under the cabin (as I mentioned earlier) will be quite a bit of the craft's mechanicals and systems. I'm thinking small mini-probes could also be deployed from underneath. The bow will be similar to the lander in housing a lot of specialized sensor arrays. And the pontoons (as mentioned earlier) will house the antigrav drive, ballast tanks and hydrojet motors.
I've already started finessing the bow details. The centre section will feature a large illumination panel for subsurface operation when visibility starts to deteriorate.