A little bit OT, but there are Brycers who love Wings, and vice versa... Err... Pakled, a better way to do it is to start with a default cylinder and cut it into quarters. Move 'em apart. Bridge two pairs, then dissolve the faces on the inside and bridge again. Makes the corners a bit rounder and nicer. Also if you wanted to play with the math, one could figure the exact corner radius and door dimensions. ...Extrude a bit here and there, etc. and you can make something like this. (Any more on this kind of stuff, and I'll start having flashbacks to when I had to look up Heintz model equivalents for QAWTD's in maritime supply vending catalog...LOL)

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.