Another opportunity to give advice.
Having tried investment casting myself, and making a mess of it, the following observations:
- Fe-wood is right, that would be the easiest.
-Casting into plaster of paris is possible, but it need to be heated beforehand to reduce thermal shock, with doubtful results anyway.
-Melting out the wax isn't easy, especially if you've got a complicated shape. That is why I bought a burn out oven to cure the investment. The wax isn't melted out so much as burned out, and the heat remove all carbon.
- And remember the important rule: "If it works for me, it is the right way to do it."
- And if you do it, lots of pictures is mandatory.