How to add statements to a PsiMethod object?

Hi, I'm trying to create a method object using a PsiElementFactory.
I've been able to create the method, and add parameters and modifiers but I can't find a way to add PsiExpression statements.

Here's the code thus far:

    PsiMethod exportMethod(GUID id) {
       
       //create method object
        PsiType type = factory.createTypeFromText(store.getName(getInstance(id,'TypeElement')),null);
        PsiMethod m = factory.createMethod(store.getName(id),type);

        //assign modifiers
        m.getModifierList().setModifierProperty('private', false);
        Object modifier = getInstance(id,'ModifierList');
        if(modifier!=null) {String text = store.getName(modifier);
            String[] modifiers = text.split(' ');
            for (String mod : modifiers) m.getModifierList().setModifierProperty(mod, true); //I add the modifiers through setModifierProperty()
        }

        //set the parameterList for the method
        PsiParameterList parameters = exportParameters(id);
        m.getParameterList().replace(parameters); //I add the parameters using replace()

        //add statements to the method (in progress)
        PsiCodeBlock block = m.getBody();
        PsiStatement[] blockExpressions = block.getStatements();
        PsiStatement[] expressions = exportStatements(id);

        return m;
    }
 

The problem I'm finding is that
a) There is no setExpressions() method.
b) I can't replace() a PsiStatement[] object.
c) While I can replace() the PsiCodeBlock, I can't assign expressions to a newly created one either.

Can anyone point me in the right direction?
Thanks in advance.