Initial set up of early Mars Colony

This is a concept of how an early Martian colony should be set up in the beginning of mankind's quest to colonize the red planet. The base is made up of nine prefabricated modules shaped like tuna-fish cans.
Each module is designed to be launched by a Saturn V rocket (or another space vehicle of similar capabilities). Every module has the ability to be self-propelled thanks to four sets of motorized wheels (this feature is included in order to position the module with the other ones when cons