This is the template for creating the Concrete targets

ConcreteTarget.tmpl

package main 

{{$target := index .ConcreteTargets 0}} 
type {{$target}}Builder struct { 
{{range .Properties -}} 
    {{.Name}} {{.TypeName}} 
{{end -}} 
} 

func new{{title $target}}Builder() *{{$target}}Builder { 
    return &{{$target}}Builder{} 
} 

{{range .Properties}} 
func (b *{{$target}}Builder) set{{if eq .TypeName `int`}}Num{{end}}{{title .Name}}() { 
    b.{{.Name}} = *new({{.TypeName}}) // replace this!! 
} 
{{end}} 

func (b *{{$target}}Builder) get{{title .ProductTarget}}() {{.ProductTarget}} { 
    return {{.ProductTarget}}{ 
    {{range .Properties -}} 
        {{.Name}}: b.{{.Name}}, 
    {{end -}} 
    } 
}