I recently received the large starter kit provided by Granthams.
Builder plates and pretty much anything else that requires any kind of text, along with difficult to carve configurations that could be easily drawn on various drawing programs, can be created with drawing or CAD programs most of us have on our computers. Having an imagination extends the capabilities beyond description, for using this kit opens many otherwise closed doors.
The kit comes with all necessary supplies to make patterns, plus a great video cassette and a pamphlet with explicit instructions on how to go about making them. The patterns can then be used for either investment or sand casting. Instructions on how to apply them are included in the video as well as the pamphlet.
A few inexpensive items are necessary to expose the photo-sensitive resin, and complete instructions, along with sources for obtaining the needed supplies are provided. Nothing exotic, all available at the local hardware store.
I highly recommend this kit for any of you that intend to do any casting of such items.
Usual disclaimers. I am not affiliated with these folks, just pleased with my kit!
Harold