Research indicates that ancient shipbuilding techniques were quite advanced. This photo of one of Rod's models, with everything correctly to scale, shows how the construction may have proceeded.

This is just a small section of a huge structure. This is one of the ends - the bow, or stern. Note the massive stem-post up the middle (near the crane), and the multi-layered floor. Also quite clearly visible are the three levels or decks, and the ladders used to access them during construction. Part of the roof has been put in place.

The Ark's dimensions were approximately 150 metres long, 25 metres wide, and 15 metres high. The construction is fairly straightforward, though - once you've done it once the next bit is much the same.

It's still an awful lot of bits of wood to cut! Maybe thats why it took them 100 years!