I'm not sure if the remnants are going to be of any help for you, Cameron -- if you look closely at IMG_3233, it should show where I cut at least one inch past the mold half line. I needed to include that area to ensure that I had a useful 'pivot' point on both sides to attach to the white opaque globe.
Where I did cut this globe was akin to it's sweet-spot for clarity. The top part of the clear globe does have an injection point (like a vending machine capsule does) and worse, the plastic is marginally distorted there. When you look directly 'down' through the top, you get a fish-eye lens effect. Kinda like the hunter-seeker POV effect in Lynch's Dune.
But, the vendor I bought the globe from is a regular Ebay seller, and the price is hard to beat for what you get. I would *strongly* consider that route!