Mould making

Trying to cast my own windows. I built a couple of masters, seen in the photo below. Small windows the same size, one with the shutter closed one open. I then took a silicone cast (shown right) and am trying out casting.

Basically I'd like to avoid having to cast them all in resin, that stuff's expensive. With a bit of work the plaster results might be ok. They're prone to bubbling and the wire mesh needs the plaster brushing on to avoid a complete mess. When I perfect the technique I'll show the cast results. Then they'll go in the tavern and all will be shiny.