Well... That was a mouthful.

If you don't enlarge the tail feathers, the boom length should increased by about the same percentage as the wing was increased I believe. I'm no designer, but there is a relationship between tail feathers and wing span.

The reason I asked about your RC experience and your motivation for this conversion is that there are a number of really great trainers out there that might help insure your success.

The GWS Slow Stick is one and costs $35 including a motor. You have the radio, so you are well on the way expense wise. The SS is an aluminum rod fuse and foam wings and builds in about 6-8 hours. Very good flier.

You might do well to start there and leave the "custom hot rod" until later.

Just my 2 cents

Sierra Gold