The feet are the difficulty. In thinking the entire procedure through, I quickly come to the question: How am I going to get the silicone mold off of the feet without breaking them? Several solutions come to mind.
- You could cut the feet off and make a mold of one or all of the feet (depending upon whether you want them to be identical or different) and then weld them onto the wax you make to invest.
- You could make the bottom part of the mold in two pieces. I think you could get the two pieces off without breaking the feet.
Also, when you make the silicone mold, you must think about how you will get the mother mold off of the silicone mold after you have poured your wax. Undercuts spell disaster. Those feet present a problem. There are two ways to handle that.
- You can add enough silicone on the sides of the box to eliminate the undercut. (A bit pricey, given the cost of silicone.)
- You could make a three or four piece mother mold.
Of course you would eliminate this problem if you cut the feet off and molded them separately.