Battle,
I would personally not use the Stevens Model 311. The action is not particularly strong, having only the one top fastener. You really want to use an action that has double under lugs PLUS a third fastener like the Grteener crossbolt(preferable), or a doll's head with bite, or a H&H type hidden third fastener. Also bushed firing pins (disc-set strikers) are a definite asset as opposed to having the pin as an integral part of the hammer (tumbler).