I am glad to hear your model went together well. I built the Beta 1, and there were a few problems. Mine is still in skeleton... I can work on lightening it up for rubber power. Can you weigh the skeleton for us? Mine weighs 48 grams. I believe it needs to be lighter.
As with you, when I got to it, this took me about 3 days...most of that time was documenting the few mistakes with Beta 1. Since you are going for rubber, I could work on modifying my frame to lighten it up. I would plan to cover mine with domestic light tissue grey and then a little green airbrushing camo. We could compare flight notes. My dihedral is as per Guillow plans for a FF model.
I can also show you how I am doing my nose block, if you would like to see that, but it sounds like you know what you are doing.
So I have a question for you. Where are you planning on the rear peg placement?
Mitch
PS: My 1000 series Hellcat weighs in at 122 grams w/o prop and motor. She has glided very well, and will get her first powered flights on Sunday!