I think your comment about a green screen not having to be bright is something way too many people trying it don't "see". They put so much light on the screen they must have bounce back on the edges of their subject. Even yes ... brilliantly bright ... no.
And that should make it so much easier than the reputation of the technique sounds like.
Saw a bts of the final battle scene in Hogwarts last movie. They had 30 or 40 foot high green scrims running for 80 or 100 feet behind their set of ruined castle. .Lit evenly enough but only to a very midtone level. Seemed to work ok in the final product ...
Neil
A lot of good advice here. Thank you! I am going to work on lighting and watch all those tutorials.
Thanks again for the help!