The interior is the same as the Gibson house's too. So what I did was basically just stick (a copy of) the Gibson house inside the Megaton house for the exterior so it still fits in with the feel of Megaton (see the last three screenshots on the final link below for the exterior screenshots).
What I liked best was the feel of a regular family house and basically their structure was intact. I'd always loved the Gibson house in Minefield, and wished we had an option to live in it in fact I usually do till I can get my own place. This is what your Megaton house usually looks like:
