Ok, if I make any mistakes in the basics please let me know.
First we need something that can carry 50 people. preferably 25 couples. these would have been chosen by the mother ship for colonization.
So the Pod ship should have 25 living quaters.
My first thoughts are something akin to an over glorified shipping conatianer with boosters(4 total) for landing the ship. from this i felt a more rounded front end for the command area was in order. now the ship must be LARGE, one floor easily holding the living quaters for the 25 couples. another floor would possibly be needed to store the initial heavy equipment of the colony. this would be a variety of tractor, mining equipment and farming equipment. For energy the obvious answer intially would be solor power. the panels for this could easily be distributed over the hull of the ship. perhaps having to be installed after landing, meaning they too would need storage areas. fuel is another issue. large areas strictly for fuel for the equipment would be needed. now this is of course assuming that supplies from the mother ship would be limited. perhaps some oil drilling equipment should also be added. this means that upon landing the first things that would need to be built would be: oil rig for energy, farms for food, mining operation for materials, logging operation for building materials, and the beginnings of road contruction to link these all together.
Ill post more as it comes to me.