Superdave,
You're probably aware of this, but in case you aren't, you need to pay particular attention to the focal length and alignment of the optics when transfering this to the new case. They need be exactly as they are in the old Act-Labs case or this isn't going to work for you. Also it's quite possible that this is going to decrease the acuracy of the gun as getting these those thing exactly right will be difficult, but I guess that's the trade off.
Good Luck with the transfer! A lot of us are interested in knowing how it goes for you. Hope it works well.