renovation

need to build a alarm system for a trailer .it has a rear and side door .i want it to go off if the doors are open . do not want it to be motion sensered . i been looking for old style car after market car alarm system .like they use to use in the pre 70 era . were you had a high pitch horn. and and a key tumbler lock to set the unit . this unit will have to have a 12 v .yard tractor battery or motorcycle battery for voltage .that will have to be charged by pulling it .as there is no power avail near were the trailer sits . they have been broke into twice now .so this is why im being asked to install a alarm on it .
i know what im looking to do . just not been able to locate a older style car alarm system .
all the units i find are motion senser type not button activated . im wanting to use the button type switchs like are used for dome lights . you open the door and the switch turns on the light .these are found in the door piller or door jam .
any help i take . thanks reno

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