If you do a search you will find that several people have. Also check on prodigy-pro.com as there is a group of possibly up to a dozen who are into it at various levels.
There are a ton of transformer options. Here's my take: Not necessarily best for what you are doing.
Also look up "home made ribbon mic" in a google search and you will see some
Spike the Mic is in Larry Killip's website - google Larry Killip
Latest News from Crowley and Tripp's Lab: Search results for ribbon microphone transformers