Just in case people aren't aware I have been using this tool that Brent Newhall made to convert AD&D and 3.5 edition D&D to 5E monsters. The original basis of the tool was originally created by Stan Shinn.
It's nice to have tools made by people who have done the heavy-lifting. Thanks guys.
I plan to do more conversions of monsters from the Fiend Folio and which are encountered in Barrowmaze for 5th Edition D&D.