Hi @smckenzie,
Thanks for your reply.
If I understood correctly, what you're trying to achieve is to resize the VFB's window to make it even smaller than its minimal default. Am I correct?
If so, please consider that the VFB has a fixed minimal UI size that cannot be modified and is set like that to ensure VFB tools display correctly. You can resize it to a bigger size.
If you want, you can use the built-in C4D's Picture Viewer window instead; this way, you'll be able to resize it according to your needs (see reference image) while still adjusting Corona parameters.
I hope this helps.
Looking forward to hearing from you.