Just to add to David's comments, also consider what you have for power. The Escape and Great Escape are definitely larger than the DB or the UFO, and the UFO, while quite sleek has a relatively 'draggy' airfoil. My first DB, built 40 years ago, had a muffled OS .60 FSR for power. 2 years later, my 3rd one had a piped OS .61VF. I competed against quite a few UFOs powered with screaming Rossis which flew very well. A strong RE .61 in the Escape or Great Escape would be preferable.
I don't know if plans for the Escape or Great Escape were ever published, but I'm sure somebody would scan or copy a set of kit plans for you. Possibly you could buy just the plans from BlueJay.