2-pound brain.
He has a skull of some kind. The most valuable organ of an intelligent being is his brain, and his brain must be protected in some manner against injury.
He has two eyes and ears. The three-eyed man from space is not a very likely creation. Two eyes are better than one for the purpose of judging distance and shape, but three would not be better than two. The same goes for ears. More eyes and ears would be useful as spares in case of accidents but earth organisms, at least, do not run to spares. We do not know the reason for this but it is logical to assume that life on other planets would not have developed
along different lines.
The eyes and ears are near the brain. Information gathered by eyes and ears must reach the brain quickly in order to be useful. This transmission by the nerves is slow. Therefore the sense organs must be close to the brain to shorten the time lag between information and reaction.
He has hands and feet . We know that our spacemen will walk erect. In order to survive, any being must be able to move around. But in order to build he would need something resembling our hands. Somewhere along the line of his development he would have had to free one pair of legs to allow them to become hands. The only way to do this is to learn to stand.
Also, it is almost certain that once on his back legs he would develop bending fingers and a thumb. To produce a high state of development he would need to pick up things, to be able to grasp, hold, push and pull. Why not tentacles , such as on an octopus? Because tentacles can pull but cannot
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